The Online Books Page

Books by Ray F. Pengra:

Books in the extended shelves:

• Pengra, Ray F.: Bibliography of South Dakota climate with annotations (Agricultural Experiment Station, South Dakota State College, 1964), also by Walter Spuhler and Dennis L. Moe (page images at HathiTrust)
• Pengra, Ray F.: Land market trends in South Dakota, 1941-1950 (Agricultural Experiment Station, South Dakota State College, 1951), also by Gabriel Lundy (page images at HathiTrust)
• Pengra, Ray F.: Likelihood of damaging low temperatures during the growing season (Agricultural Economic Dept., Agricultural Experiment Station, South Dakota State College, 1954), also by M. D. Magnuson (page images at HathiTrust)
• Pengra, Ray F.: Using climatic water balance to determine irrigation needs in South Dakota (Economics Dept., Agricultural Experiment Station, South Dakota State College, 1961) (page images at HathiTrust)
• Pengra, Ray F.: Variation of precipitation in South Dakota (Economics Dept., Agricultural Experiment Station, South Dakota State University, 1964) (page images at HathiTrust)

Find more by Ray F. Pengra at your library, or elsewhere.