John D. Hamaker
(1914-1994)
Mechanical engineer, ecologist, agronomist
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John D. Hamaker (1914–1994), was an American mechanical engineer, ecologist, agronomist and science writer in the fields of soil regeneration, rock dusting, mineral cycles, climate cycles and glaciology.
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| Born |
1914 St. Louis, Missouri, United States
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| Died |
1994 (aged 79)
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