By Helmers A. E.   in Journal of Forestry

ISSN:0022-1201|58|6|465-471

Society of American Foresters‎(1960)‎

Access to resources Favorite 16.247784

By Helmers Austin E.   in Journal of Forestry

ISSN:0022-1201|44|9|673-676

Society of American Foresters‎(1946)‎

Access to resources Favorite 2.8965297

By BECKWITH ROY C.   HELMERS AUSTIN E.   in Environmental Entomology

ISSN:1938-2936|5|2|291-294

Entomological Society of America‎(1976)‎

Access to resources Favorite 2.1723971