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close this section of the libraryCallahan, John Conrad, 1923- 2n(2)
View the documentCallahan, John Conrad, 1923- 2n; Economic returns associated with fifty nonindustrial, private woodlands in Indiana / John C. Callahan. Lafayette, Ind. : Purdue University Agricultural Experiment Station, 1966.
View the documentCallahan, John Conrad, 1923- 2n; Economic aspects of commercial outdoor recreation enterprises in Southern Indiana / John C. Callahan and Douglas M. Knudson. Lafayette, Ind. : Purdue University Agricultural Experiment Station, 1966.