Environmental requirements and pollution tolerance of Plecoptera /

Issued Oct. 1978.

Environmental requirements and pollution tolerance of ephemeroptera /

Oct. 1978.

A book of trout flies; containing a list of the most important American stream insects & their imitations,

Edited by Dr. Spieth. cf. Pref.

Die Facettenaugen der Ephemeriden.

Reprint from Zeitschrift für wissenschaftliche Zoologie, Bd. LXIII, Heft 2.