I found this delightful book "Fishes of the Wissahickon Creek", by R. Bruce Gebhardt, at the Free Library in Chestnut Hill. It is theoretically possible to order it from the Academy of Natural Sciences (tho my order has not arrived yet): https://secure.touchnet.com/C20688_ustores/web/store_cat.jsp?STOREID=73&CATID=514&SINGLESTORE=true
The intro says he also self-published "Butterfly Blocks: The Butterflies of West Mount Airy (2002-2004)". I tried asking the Academy about it and they know nothing. Any ideas for finding a copy?

In his original manuscript for this work, Bruce extended an invitation to readers to contact him about their own fish discoveries, offering to help confirm their identifications and to provide supplemental information.
One of Bruce's great pleasures in the wake of the publication of his self-published Butterfly Blocks: The Butterflies of West Mount Airy (2002-2004) had been a similar email correspondence with his readers. In addition to fish and butterflies, Bruce's love of nature also encompassed sea shells, birds, reptiles, and mammals.

ACADEMY OF NATURAL SCIENCES OF PHILADELPHIA SPECIAL PUBLICATION NO. 26
FISHES OF THE WISSAHICKON CREEK
R. BRUCE GEBHARDT
Including Fish Photography by the Author
The Academy of Natural Sciences of Philadelphia | 2024