File contains two copies of the booklet "Birds of Cortes and Mittlenatch Islands, a checklist with seasonal graphs" by George Sirk, Christian Gronau and Fred Zwickel, published by the authors in 1993.
File contains two copies of the booklet "Birds of Cortes and Mittlenatch Islands, a checklist with seasonal graphs" by George Sirk, Christian Gronau and Fred Zwickel, published by the authors in 1993.
File consists of a paperback book "Birds: A Guide to the Most Familiar American Birds", with notes on dates and locations of bird sightings on Cortes Island made by Otto Weiler and Brigid Weiler. The cover is missing.
File consists of a paperback book "Birds: A Guide to the Most Familiar American Birds", with notes on dates and locations of bird sightings on Cortes Island made by Otto Weiler and Brigid Weiler. The cover is missing.