The Online Books Page

Books by D. J. Wiersma:

Books in the extended shelves:

• Wiersma, D. J. (Daniel J.), 1916-: An economic analysis of water, nitrogen and seeding rate relationships in irrigated corn production (Purdue University Agricultural Experiment Station, 1962), also by LaVon E. Smith and D. Woods Thomas (page images at HathiTrust)
• Wiersma, D. J. (Daniel J.), 1916-: Irrigated corn yields in the north central region of the United States (Iowa Agriculture and Home Economics Experiment Station, Iowa State University of Science and Technology, 1970), also by C. E. Beer (page images at HathiTrust)
• Wiersma, D. J. (Daniel J.), 1916-: Proceedings and recommendations of the Workshop on Ground Water Problems in the Ohio River Basin : April 28-29, 1981, Cincinnati, Ohio (The Center, 1981), also by Ohio) Workshop on Ground Water Problems in the Ohio River Basin (1981 : Cincinnati, A. Ramachandra Rao, Edward J. Hood, Ohio River Basin Commission, and Purdue University. Water Resources Research Center (page images at HathiTrust)

Find more by D. J. Wiersma at your library, or elsewhere.