'Forecasting the growth of nations', Harpers
Tags: 1914-1918; 1920s; 1921; 1921-5-1; Birth control; Europe; Influence; Kelly, Fred C. (Fred Charters); Medicine; Moral and ethical aspects; Pearl, Raymond; Population; Population forecasting; Reproduction and Development; Statistics; United States; World War I
'The pleasures of a naturalist', Harpers
Tags: 1920s; 1921; 1921-5-1; Behavior; Beneficial birds; Biology; Bird watching; Birds; Burroughs, John; Catskill Mountains; Charles Darwin; Evolution; Insects; Meteorological optics; Naturalists; Nature study; New York (State); Ornithology; Weather forecasting; Zoology
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