Title: Encyclopedia of marine mammals
Subjects: Marine mammals, Encyclopedias, Reference, Fisheries & aquaculture, Evolution, General, Ecology, Physical & earth sciences -> physics -> general, Trades & technology -> forestry/wildlife/fisheries -> fisheries, General interests & hobbies -> nature -> nature, Biological sciences & nutrition -> environmental science & ecology -> ecology, Biological sciences & nutrition -> environmental science & ecology -> evolution, Biological sciences & nutrition -> biology -> zoology, Long Now Manual for Civilization