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?