A census of the breeding birds of an aspen association.

http://deepblue.lib.umich.edu/bitstream/2027.42/52045/1/476.pdfDescription of 476.pdf : Access restricted to on-site users at the U-M Biological Station

A study of the breeding biology of the Purple Martin (Progne subis).

http://deepblue.lib.umich.edu/bitstream/2027.42/52046/1/477.pdfDescription of 477.pdf : Access restricted to on-site users at the U-M Biological Station