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NTcrater lakes
 ephemeral lakes
 glacial lakes
 meromictic lakes
RTdrainage
 ecology
 eutrophication
 extinct lakes
 geomorphology
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 glaciolacustrine environment
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 lacustrine environment
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 lagoons
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 lake-level changes
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 limnology
 pale
SNUsed for the geomorphologic feature. As of 1981, use lacustrine environment for type of environment. Before 1972, was sometimes used in combination with extinct (i.e. lakes, extinct). Now use extinct lakes. Also index lacustrine features as applicable.