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.