[019-15] Survey of Trees and Shrubs of Morgan County
Survey of Trees and Shrubs of Morgan County Authors: Smith, Isabel, Bergman, Ross M, and Glenna V. Smith
[019-14] Collecting Water Mites in Cuba
Collecting Water Mites in Cuba Author: Marshall, Ruth
[019-13] Some New Insect Galls
Some New Insect Galls Author: Groneman, Carl F.
[019-12] Life History Studies of the Peach Borer in Southern Illinois
Life History Studies of the Peach Borer in Southern Illinois Author: Chandler, S.C.
[019-11] Some Problems in Teaching Soil Fertility
Some Problems in Teaching Soil Fertility Author: Muckelroy, R.E.