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  • John D. Hamaker - Revolvy

    John D. Hamaker (1914–1994), was an American mechanical engineer , ecologist , agronomist and science writer in the fields of soil regeneration , rock dusting ...

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  • John D Hamaker- Biography - climaterealists.nz

    1984, China's Research Institute of Forests accepted Hamaker's gift of his patent for a rock- crushing grinder to remineralize the soil, since China was leading the world in reforestation programs.

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