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Types of Farming in Illinois

Elmer RobertsFrederick Charles BauerFrederick Francis WeinardHarold Clayton M. CaseJohn William LloydPaul Hubert TracyRobert Childers AshbyRoland Willey BartlettRuth Crawford FreemanHarrison August RueheKenneth Hayes MyersSamuel Wesley DeckerWalker Myrick DawsonRussell Jennings Ramsey

其他書名	An Analysis of Differences by Areas
出版	University of Illinois Agricultural Experiment Station, 1934
URL	http://books.google.com.hk/books?id=WXFRAQAAMAAJ&hl=&source=gbs_api