Plan for cooperating in the study of available plant food Moore, Charles C. (Charles Chilton), 1837-1906 creator text book Washington 1902 1902
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ENG Nutrition Plants Soils Circular (United States. Bureau of Chemistry), 9 https://www.biodiversitylibrary.org/bibliography/19424 27950881 10.5962/bhl.title.19424 YAM