Iowa parks. Conservation of Iowa historic, scenic and scientific areas. Also, a description of numerous areas suitable for public state parks, with reasons for their preservation. Report of the State board of conservation S Agriculture
Insects and human welfare : an account of the more important relations of insects to the health of man, to agriculture, and to forestry S Agriculture
Applied forestry, written particularly for owners and managers; explaining certain methods of foresters toward conserving property values and providing maximum returns from current operations S Agriculture
