Studies In Kansas InsectsUniversity of Kansas. Dept. of Entomolog, Peter Walter Claassen, Raymond Hill Beamer · First published 2018Open the Tome
Plecoptera nymphs of America (north of MexicoPeter Walter Claassen · First published 1931Open the Tome
Plecoptera nymphs of America (north of Mexico)Peter Walter Claassen · First published 1931Open the Tome
A Monograph of the Plecoptera or Stoneflies of America North of MexicoPeter Walter Claassen, Needham, James G. · First published 1925Open the Tome
Laboratory directions in general biology prepared to accompany text book on General biologyPeter Walter Claassen · First published 1922Open the Tome
The larva of a Chironomid (Trissocladius equitans n. sp.) which is parasitic upon a May-fly nymph (Rithrogena sp.)Claassen, Peter Walter, 1886-1937, University of Kansas · First published 1922Open the Tome
