'Sleep and insomnia', Harpers
Tags: 1930s; 1938; 1938-11-1; Gray, George W. (George William); Hypnotics; Insomnia; Medicine; Psychology, Psychiatry and Psychotherapy; Research; Sleep; Sleep and Dreams; United States
'The man with a tractor', Harpers
Tags: 1930s; 1938; 1938-11-1; Engineering; Farm mechanization; Farmers; Great Plains; Mayo, Morrow; Mechanical Engineering; Sowing; Wheat
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