TY  - BOOK
AU  - Claassen,Peter W.
TI  - Plecoptera nymphs of America: (North of Mexico) 
PY  - 1931///
CY  - Springfield, Ill.
PB  - Charles C. Thomas
KW  - Stoneflies
KW  - Mexico
KW  - America
N1  - Published for The Thomas Say Foundation
ER  -