A study of the arsenic content of Pennsylvania tobacco and tobacco soils Ilgen, Lewis Wallace. creator text book 1937 1937
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ENG Thesis (M.S.)--Pennsylvania State College. Arsenic content Pennsylvania Soils Tobacco Pennsylvania agricultural literature on microfilm USAIN state and local literature preservation project, Pennsylvania https://www.biodiversitylibrary.org/bibliography/44174 38092484 10.5962/bhl.title.44174