Revision of the american species of empoasca known to occur north of Mexico
DeLong, D.M.
Revision of the american species of empoasca known to occur north of Mexico - Washington 1931 - 1-60 p. - United States Department of Agriculture. Technical Bulletin No. 231 .
Revision of the american species of empoasca known to occur north of Mexico - Washington 1931 - 1-60 p. - United States Department of Agriculture. Technical Bulletin No. 231 .