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1Brookings, S.D. : Agricultural Experiment Station, South Dakota State University.volumes : illustrations ; 28 cm.Center for Research Libraries: no.44-70 (Apr 1978-Jul 1984); no.81-88 (Jan-Apr 1985)
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2[Columbus] : Dept. of Agricultural Economics & Rural Sociology, Ohio State University : Ohio Cooperative Extension Service.volumes ; 28 cm.Center for Research Libraries: no.450-496 (May 1970-1973)
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