1. 1
   Iowa farm record summary

   Ames, Agricultural Extension Service, Iowa State College.

   15 v. maps, tables. 28 cm.

   主題: “...Agriculture Economic aspects Iowa....”
   

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2. 2
   Farm outlook

   出版 1938

   Ames : The Service, 1938-1939.

   2 v. : ill.

   主題: “...Agriculture Economic aspects Iowa Periodicals....”
   

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