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L17 - Victor Medrano
LáAdan - Suzette Haden Elgin
Lacue - Eirik Olsen
Ladekwa - Rick Morneau
Lahabic - Marcus Miles
Laikath
Lainesco
Lakal/Saradic - Certic
La Lengua Universal
Lalortel - Robert N. Yetter
Lan - Drydic_Guy
Landero - Decker
Language of Center, The - Robert A. Heinlein
Languages of the Commonwealth - Adam Walker
Language X
Langue Nouvelle - Faiguet
Langue Universelle - C. Letellier
LANGUST - Grigoriy Korolev
LangX
Lannu den gental - Morris
Lano - M. Martin
Lanrohidh'il - Alison Fisher
Lapine - Richard Adams
Lara - Alessandro Pedicelli
Larenti Tergush - Tiogshi Laj
Larua - Darrell Manrique
Larveson - Wyvere
Lasa - Mark McGrath
Lashkos - Christopher Wright
Latalmish - Ian Burleson
Late Nietanian - Gideon O. Ioffe
Late Réziko - J.T. Antley
Latineo - Jay Bowks
Latino Moderne - David Th. Stark
Latino Sine Flexione - Giuseppe Peano
Latinvlo - Stephen Houghton / Paul Bartlett
Latötsc - Brian Suchsland-Gutiérrez
Laval - M. Martin
Laxonomasoljomijodo - Quentin Read
Leibniz's Characteristica Universalis - G.W. Leibniz
Leksventin
Lemurian - Sander Dieleman
Lemyzon - Geoff Eddy
Lengua Universal - Bonifacio Sotos Ochando
Lengua Universal - L. Selbor
Len-q?is - Tommaso Donnarumma
Lepidopteran (Ze) - Dazi
Lesdekan - David Johnson (Sonib)
Lesko - Shawn C. Knight
Leturian - Patrick Pfeaster
Ley Arah - Jashan A'al
Liaden - Sharon Lee, Steve Miller
Li' Anyerra-Tarah - Wesley Parish
Life Sound - mikulzqm
Lifhomese - Adam Walker
Lijou
Lilipu - Victor Medrano
Limciela - Jim Taylor
Lin - Skrintha
LINC - Igor Garshin
Lincos - Dr. Hans Freudenthal
Linear A/Minoan - Edward Hatfield
Lingo
Lingua Franca Nova - Dr. C. George Boeree
Lingua Ignota - Hildegarde of Bingen
Lingualumina - Frederick William Dyer
Liniyai-Karmisa - Eric Anger
Linka Romànika - Dana Hadar
Liñxî - Andrew J. Meilstrup
Liotan - Geoff Eddy
Lips Kith - Scarisbrick, Joseph
Lipu'onai - Amanda Smith
Litaja - Ian K. Hunter
Liva - Claudio Gnoli
Livagian - And Rosta
Llàtec - Nicola Curat
Llathos - Pharazon
Llegisia - Jim Henry
Loglan - James Cooke Brown
Loglan 76
Loglan 95
Logli - Marcos Cramer
Logopandectesion - Thomas Urquhart
Logsan - Filip Skwarski
Logulos - Shawn C. Knight
Lojban - The Logical Language Group
Lojsk - Ariano Reyes
Lone - Risto Kupsala
Long Wer - Sophia Abraham (Ábrahám Zsófia) aka Mau Rauser
Loroi Trade - Jim Francis
Low Orkish - Merle D. Zimmermann
Lrahran - Adam Walker
Lûá - Fen Yik
Ludireo - Herman Miller
Ludycian - Alex Beaverstone
Lugasuese - Jurre Lagerwaard
Luinin - Boomajoom
Luni - Florent Garet
Lusane - Luis Sainz Lopez-Negrete
Lusiaquía - Stefan Lubbersen
Lydnevi - Libor Sztemon
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