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- l'anse aux meadows
- l'hôpital's rule
- la brea tar pits
- la niña
- la perouse strait
- la rioja
- la scala
- la tène
- labor day
- laboratory
- labour
- labour economics
- labour law
- labour party
- labour union
- labrador
- labrador current
- labradorite
- labyrinth
- lacandón
- lace
- lacemaking
- lacewing
- lachlan river
- laconia, gulf of
- lacquerwork
- lacrosse
- lactation
- lactic acid
- lactobacillus
- lactose
- ladakh
- ladies' home journal
- ladino
- ladino language
- lado enclave
- lady's slipper
- ladybug
- ladyfish
- laetoli footprints
- lagash
- laghouat
- lagoon
- laibach, congress of
- laissez-faire
- lake
- lake clark national park and preserve
- lake district
- lake dwellings
- lake placid
- lake trout
- lake turkana remains
- lakewood
- lakshadweep
- lakshmi
- lama
- lamashtu
- lamb
- lamb's ears
- lambkill
- laminar flow
- lamprey
- lampsacus
- lan na
- lan sang
- lancashire
- lancaster, house of
- lancelot
- lancet, the
- land
- land mine
- land reform
- land's end
- land-grant college act of 1862
- ländler
- landlord and tenant
- landrum-griffin act
- landsat
- landscape gardening
- landslide
- langerhans, islets of
- language
- language, philosophy of
- languedoc
- lantana
- lanthanide
- laocoön
- laozi
- laparoscopy
- lapis lazuli
- lapita culture
- laplace transform
- laplace's equation
- lapland
- lapwing
- laramide orogeny
- larch
- lares
- large intestine
- laristan