Urbana, Ill. : University of Illinois, College of Agriculture, Extension Service in Agriculture and Home Economics : in cooperation with Illinois State Natural History Survey,
Urbana, Ill. : University of Illinois, College of Agriculture, Extension Service in Agriculture and Home Economics : in cooperation with Illinois Natural History Survey,
56 p.Thesis (Ph.D.)--University of Illinois at Urbana-Champaign, 1956.U of I OnlyRestricted to the U of I community idenfinitely during batch ingest of legacy ETD
Urbana, Ill. : University of Illinois, College of Agriculture, Extension Service in Agriculture and Home Economics : in cooperation with Illinois State Natural History Survey,