General results of the investigations showing the effect of formaldehyde upon digestion and health United States. Bureau of Chemistry. contributor text book Washington Govt. print. off 1908 1908
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ENG Formaldehyde Circular (United States. Bureau of Chemistry), no. 42 https://www.biodiversitylibrary.org/bibliography/18532 29738652 10.5962/bhl.title.18532 Library, U.S. Dept. of Agriculture