Books by Heber Wilkinson Youngken:
Books in the extended shelves:
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Youngken, Heber Wilkinson, 1913-: Common poisonous plants of New England (U.S. Dept. of Health, Education, and Welfare, Public Health Service;, 1964), also by Joseph S. Karas (page images at HathiTrust)- Youngken, Heber Wilkinson, 1913-: Typical poisonous plants ([U.S. Dept. of Health, Education, and Welfare, Bureau of Product Safety : for sale by the Supt. of Docs., U.S. Govt. Print. Off], 1973), also by Joseph S Karas (page images at HathiTrust)
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