| Picture File | Related File | Code |
| Labels | | LA |
| Labor–Allegorical | | LAB–All |
| Labor history | | LAB–His |
| Laboratories | | LABO |
| | Alchemy | ALC |
| Laboratories — 1899 & earlier | | LABO–18 |
| Laboratories — Biology | | LABO–Bio |
| Laboratories — Chemistry | | LABO–Che |
| Laboratories — Equipment | | LABO–Equ |
| Laboratories — Historic | | LABO–His |
| Laboratories — Medicine | | LABO–Med |
| Laboratories — Physics | | LABO–Phy |
| Laboratory buildings | | LABOB |
| Laborers | | LABOR |
| Labyrinths | | LABY |
| | London–Palaces | LON–Pal |
| | Mythology–Theseus | MYT–The |
| | Palaces–France–Fontainebleau | PAL–Fra–Fo |
| | Palaces–France–Versailles | PAL–Fra–Ve |
| Lace | | LACE |
| Lace — Flemish | | LACE–Fle |
| Lace — French | | LACE–Fre |
| Lace — Italian | | LACE–Ita |
| Lace — Knotted lace | | LACE–Kno |
| Lace as worn | | LACE–Wor |
| Lace making | | LACEM |
| Lacquer | | LACQ |
| Lacrosse | | LACR |
| Ladders | | LAD |
| Lakes | | LAK |
| Lamp shades | | LAM |
| Lamplight | | LAMPL |
| Lamps — 1899& earlier | | LAMPS–18 |
| Lamps — 1901s–1950s | | LAMPS–190 |
| Lamps — 1960s | | LAMPS–196 |
| Lamps — 1970s | | LAMPS–197 |
| Lamps — 1980s | | LAMPS–198 |
| Lamps — 1990s | | LAMPS–199 |
| Lamps — 2001s | | LAMPS–200 |
| Lamps — Ancient | | LAMPS–Anc |
| Lamps — Art Nouveau | | LAMPS–Art |
| Landing barges & boats | | LANDI |
| Landlords | | LANDL |
| Landscapes | | LANDS |
| Landscapes — Design | | LANDS–Des |
| Landscapes — Drawings & prints | LANDS–Dra |
| Landslides | | LANDSL |
| Lanterns | | LANT |
| Laos | | LAO |
| Lapps | | LAP |
| Lassoing | | LAS |
| Lathes | | LAT |
| Laughter | | LAU |
| Laundering | | LAUN |
| | Advertising–Soaps | ADV–Soa |
| Laundering — 1799 & earlier | | LAUN–17 |
| Laundering — 1800s | | LAUN–18 |
| Laundering — 1900s | | LAUN–19 |
| Laundering — 2000s | | LAUN–20 |
| Laundering — Drying | | LAUN–Dry |
| Laundering — Equipment | | LAUN–equ |
| Laundering — Washing in streams | LAUN–Was |
| Laundries | | LAUND |
| Laundry transportation | | LAUND–Tra |
| Lavatories | | LAV |
| Law & lawyers | | LAW |
| Law & lawyers — Allegorical | | LAW–All |
| Law & lawyers — Cartoons | | LAW–Car |
| Lead industry & mining | | LEAD |
| Leadwork | | LEADW |
| League of Nations | | LEAG |
| Leap year | | LEAP |
| Leather | | LEAT |
| Leather goods | | LEAT–Goo |
| Leatherwork | | LEAT–Wor |
| Leaves | | LEAV |
| Leaves — Design | | LEAV–Des |
| Leaves — Sculpture | | LEAV–Scu |
| Lebanon | | LEB |
| Lebanon — A–Z | | LEB–(A–Z) |
| Lebanon — Baalbek | | LEB–Baa |
| Lebanon — History | | LEB–His |
| Legs | | LEG |
| Lent (Season) | | LEN |
| Leprosy | | LEP |
| Lesotho | | LES |
| Lesotho — Life | | LES–Lif |
| Letter writing | | LET |
| Letterheads | | LETH |
| Lettering | | LETT |
| Lettering — Incised | | LETT–Inc |
| Lettering — Initials | | LETT–Ini |
| Lettering — Process | | LETT–Pro |
| Lettering — Script | | LETT–Scr |
| Levees | | LEV |
| Liberia | | LIB |
| Liberia — Life | | LIB–Lif |
| Liberty–Allegorical | | LIBE–All |
| | New York City–Statue of Liberty | NEW YC–Statu |
| Libraries | | LIBR |
| Libraries — 1899 & earlier | | LIBR–18 |
| Libraries — A–L (Subdivided by country) | | LIBR–(A–L) |
| Libraries — Cartoons | | LIBR–car |
| Libraries — M–Z (Subdivided by country) | | LIBR–(M–Z) |
| Libraries — Traveling | | LIBR–Tra |
| Libraries — United States | | LIBR–US |
| Libya | | LIBY |
| Libya — History | | LIBY–His |
| Libya — Industries | | LIBY–Ind |
| Libya — Life | | LIBY–Lif |
| License plates | | LIC |
| Lichens | | LICH |
| | Mosses | MOSS |
| Liechtenstein | | LIE |
| Lies & lying | | LIES |
| Life–Allegorical | | LIFE–All |
| Lifeboats | | LIFEB |
| Lifesaving | | LIFES |
| | Rescues & survivors | RESC |
| | Shipwrecks | SHIPW |
| Lifesaving — Breeches buoy | | LIFES–Bre |
| Light | | LIG |
| | Spectrum | SPECTR |
| Light — Art | | LIG–Art |
| Lighthouses | | LIGH |
| Lighthouses — Eddystone | | LIGH–Edd |
| Lighthouses — United States | | LIGH–US |
| Lighting | | LIGHT |
| | Advertising–Electricity | ADV–Ele |
| Lighting — 1899 & earlier | | LIGHT–18 |
| Lighting — 1900s | | LIGHT–19 |
| Lighting — Exterior | | LIGHT–Ext |
| Lighting — Floodlights | | LIGHT–Flo |
| Lighting — Ship | | LIGHT–Shi |
| Lightning | | LIGHTN |
| Lightships | | LIGHTS |
| Lime | | LIME |
| Limestone | | LIMES |
| Linecuts | | LIN |
| Linen | | LINEN |
| Lips | | LIP |
| Liquor traffic | | LIQ |
| | Advertising–Liquors | ADV–Liq |
| Liquor traffic — A–Z (Subdivided by country) | | LIQ–(A–Z) |
| Liquor traffic — Stills | | LIQ–Sti |
| Liquor traffic — United States | | LIQ–US |
| Listening | | LIS |
| Litters | | LIT |
| Loading & unloading | | LOA |
| Lobster industry | | LOB |
| Lobsters | | LOBS |
| Locker rooms | | LOC |
| Locks | | LOCK |
| London | | LON |
| London — 1699 & earlier | | LON–16 |
| London — 1700s | | LON–17 |
| London — 1800s | | LON–18 |
| London — 1900s | | LON–19 |
| London — 2000s | | LON–20 |
| London — Air views | | LON–Air |
| London — Airports & terminals | | LON–Airp |
| London — Albert Hall | | LON–Alb |
| London — Art galleries & shows | | LON–Art |
| London — Bank of England | | LON–Ban |
| London — Banks | | LON–Bank |
| London — Bridges | | LON–Bri |
| London — Bridges — 1899 & earlier | LON–Bri–18 |
| London — British Museum | | LON–Brit |
| London — Building construction | | LON–Bui |
| London — Bush House | | LON–Bus |
| London — Cafes | | LON–Caf |
| London — Cathedrals | | LON–Cat |
| London — Cathedrals–Saint Paul's | LON–Cat–Sai |
| London — Cathedrals–Westminster | LON–Cat–Wes |
| London — Celebrations | | LON–Cel |
| London — Charter House | | LON–Cha |
| London — Chelsea | | LON–Che |
| London — Children | | LON–Chi |
| London — Churches | | LON–Chu |
| London — Clubs & societies | | LON–Clu |
| London — Colleges & universities | LON–Col |
| London — Courts | | LON–Cou |
| London — Covent Garden | | LON–Cov |
| London — Crystal Palace | | LON–Cry |
| London — Demonstrations | | LON–Dem |
| London — Drawings & prints | | LON–Dra |
| London — Embankment | | LON–Emb |
| London — Embassies | | LON–Emba |
| London — Exchanges | | LON–Exc |
| London — Fire Department | | LON–Fir |
| London — Fires | | LON–Fire |
| London — Fog | | LON–Fog |
| London — Gates | | LON–Gat |
| London — Government | | LON–Gov |
| London — Government–Buildings | LON–Gov–Bui |
| London — Greenwich | | LON–Gre |
| London — Guildhall | | LON–Gui |
| London — Guilds | | LON–Guil |
| London — Hampstead Heath | | LON–Ham |
| London — Homes (Institutional) | | LON–Hom |
| London — Hospitals | | LON–Hos |
| London — Hotels | | LON–Hot |
| London — Houses | | LON–Hou |
| London — Housing projects | | LON–Hous |
| London — Inns & taverns | | LON–Inn |
| London — Libraries | | LON–Lib |
| London — Life | | LON–Lif |
| London — Life — 1899 & earlier | | LON–Lif–18 |
| London — Limehouse | | LON–Lim |
| London — Lloyd's | | LON–Llo |
| London — Lodging houses | | LON–Lod |
| London — Lord Mayor | | LON–Lor |
| London — Maps | | LON–Map |
| London — Markets | | LON–Mar |
| London — Monuments | | LON–Mon |
| London — Museums | | LON–Mus |
| London — Music halls | | LON–Musi |
| London — Newspapers | | LON–New |
| London — Night clubs | | LON–Nig–Cl |
| London — Night scenes | | LON–Nig–Sc |
| London — Number 10 Downing Street | LON–Num |
| London — Office buildings | | LON–Off |
| London — Palaces | | LON–Pal |
| | London–Tower | LON–Tow |
| | London–Whitehall | LON–Whi |
| London — Palaces–Guards | | LON–Pal–Gua |
| London — Parades | | LON–Par |
| London — Parks | | LON–Park |
| London — Parliament houses | | LON–Parl |
| London — Peddlers | | LON–Ped |
| London — Piccadilly Circus | | LON–Pic |
| London — Police | | LON–Pol |
| London — Prisons | | LON–Pri |
| London — Public buildings | | LON–Pub |
| London — Pubs | | LON–Pubs |
| London — Railroad stations | | LON–Rai |
| London — Restaurants | | LON–Res |
| London — Rivers | | LON–Riv |
| London — Royal Academy | | LON–Roy–Ac |
| London — Royal Exchange | | LON–Roy–Ex |
| London — Schools | | LON–Sch |
| London — Scotland Yard | | LON–Sco |
| London — Slums | | LON–Slu |
| London — Snow | | LON–Sno |
| London — Soho | | LON–Soh |
| London — Squares | | LON–Squ |
| London — Stores | | LON–Sto |
| London — Streets | | LON–Str |
| London — Streets–Cheapside | | LON–Str–Che |
| London — Streets–Fleet | | LON–Str–Fle |
| London — Streets–Pall Mall | | LON–Str–Pal |
| London — Streets–Regent | | LON–Str–Reg |
| London — Streets–Strand | | LON–Str–Str |
| London — Subways | | LON–Sub |
| | Air raids–Shelters | AIR–Rai–Sh |
| London — Temple | | LON–Tem |
| London — Temple — Bar | | LON–Tem–Ba |
| London — Theatres | | LON–The |
| London — Tower | | LON–Tow |
| London — Traffic | | LON–Tra |
| London — Transportation | | LON–Tran |
| London — Tunnels | | LON–Tun |
| London — Westminster Abbey | | LON–Wes |
| London — Wharves & docks | | LON–Wha |
| London — Whitehall | | LON–Whi |
| London — Zoological parks | | LON–Zoo |
| Longshoremen | | LONG |
| Lookouts | | LOO |
| Louisiana | | LOU |
| Louisiana — 1899 & earlier | | LOU–18 |
| Louisiana — A–Z | | LOU–(A–Z) |
| Louisiana — Baton Rouge | | LOU–Bat |
| Louisiana — Industries | | LOU–Ind |
| Louisiana — Life | | LOU–Lif |
| Louisiana — New Orleans | | LOU–New |
| Louisiana — New Orleans — 1899 & earlier | LOU–New–18 |
| Love | | LOV |
| Love — Allegorical | | LOV–All |
| Love — Cartoons | | LOV–Car |
| Luggage | | LUG |
| Luggage — 1899 & earlier | | LUG–18 |
| Luggage — 1901s–1940s | | LUG–190 |
| Luggage — 1950s | | LUG–195 |
| Luggage — 1960s | | LUG–196 |
| Luggage — 1970s | | LUG–197 |
| Luggage — 1980s | | LUG–198 |
| Luggage — 1990s | | LUG–199 |
| Luggage — 2001s | | LUG–200 |
| Lumber | | LUM |
| Lumbering | | LUMB |
| Lumbering — 1899 & earlier | | LUMB–18 |
| Lumbering — Felling | | LUMB–Fel |
| Lumbering — Hauling | | LUMB–Hau |
| Lumbering — Log driving | | LUMB–Logd |
| Lumbering — Log rafts | | LUMB–Logr |
| Lumberjacks | | LUMBJ |
| Lunch containers | | LUN |
| Luxembourg | | LUX |
| Lynching | | LYN |