classifications
| search classifications for: Macarthur, Robert (Helmer) |
Natural history personalities, biologists, naturalists, evolutionists, museum directors, geneticists, embryologists, microscopists, cytologists, taxonomists, photographers, natural history TV presenters (excludes those working only on humans)
Environmentalists, conservationists, ecologists, relevant researchers
Zoologists, ethologists, marine biologists, animal anatomists, animal physiologists, showmen, cattlemen, big-game hunters, breeders, humanitarians, photographers, artists
Canada (later - classify into provinces)
United States of America
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