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- Leptothrix
- Leray, Jean
- Lerch, Mathias
- Lereboullet, Dominique-Auguste
- Lerner, I(Sadore) Michael
- Lesage, George-Louis
- Lesley, J. Peter
- Leśniewski, Stanis
- Lesquereux, Leo
- lesser rorqual
- Lesson, René-Primev
- leste
- leste
- Lestidae
- Lestoideidae
- Lesueur, Charles-Alexandre
- lethal allele
- lethal dose 50
- Lethrinidae
