"Planned and conducted by a subcommittee of the Agricultural Committee of the Greater Des Moines Chamber of Commerce."
"Published under the auspices of the Agricultural Committee of the Greater Des Moines Chamber of Commerce with the cooperation of the Iowa State University Center for Agricultural and Economic Development."
xxxii, 616 p., [3] leaves of plates : ill., maps, ports. ; 21 cm
Notes
Maps on end papers
"Authorised by the Minister of Education for use in the high schools and collegiate institutes of Ontario, and by the Advisory Board for use in Manitoba"