Books by Helen M. Strong:
Books in the extended shelves:
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Strong, Helen M. (Helen Mabel), 1890-1973: Distribution of agricultural exports from the United States (Govt. Print. Off., 1924), also by United States Bureau of Foreign and Domestic Commerce (page images at HathiTrust)- Strong, Helen M. (Helen Mabel), 1890-1973: Relation between value and volume of agricultural products (Govt. print. off., 1924), also by United States Bureau of Foreign and Domestic Commerce (page images at HathiTrust)
- Strong, Helen M. (Helen Mabel), 1890-1973: Soil and water conservation in the elementary school (Washington, D.C., 1940), also by Marjorie Haines Campbell and United States. Soil Conservation Service (page images at HathiTrust)
Find more by Helen M. Strong at your library, or elsewhere.