. Biology and human life. Biology. THE EARTH FOR MANKIND 541 efforts to increase his production by making improvements along every possible line. The chemistry of soil enables him to modify the soil in accordance with the needs of special crops. The use of machinery enables one man to plow a hundred. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Gruenberg, Benjamin C. (Benjamin Charles), 1875-1965. Boston, New York [etc.
. Biology and human life. Biology. THE EARTH FOR MANKIND 541 efforts to increase his production by making improvements along every possible line. The chemistry of soil enables him to modify the soil in accordance with the needs of special crops. The use of machinery enables one man to plow a hundred. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Gruenberg, Benjamin C. (Benjamin Charles), 1875-1965. Boston, New York [etc. ] Ginn and Company
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Keywords: ., bookcentury1900, bookdecade1920, bookpublishe, booksubjectbiology