The collection consists of Ralph Brown's 1945 compilation of correspondence on passenger pigeons.

Brown was a Virginia Tech librarian working under the request of a professor A. L. Dean of the V. P. I. Agricultural extension division. The latter had made inquiries to ornithologists regarding "the possibility that the extermination of the passenger pigeon was caused by disease."

All the six ornithologists contacted disagreed with Dean's hypothesis. "Market hunting," not illness, they affirmed, brought about the end to the passenger pigeon.

More specifically, Dr. S. C. Bishop of the University of Rochester wrote that "so far as [he] is concerned, there [was] no particular mystery about the end of the Passenger Pigeon. It was slaughtered by the millions." John T. Zimmer and A. C. Bent who represent the American Museum of Natural History and Smithsonian Institution, respectively, also agreed. Nonetheless, Bent offers some hope to the initial theory by noting that "there may have been some disease or weakening from in-breeding, which brought about the end." Similarly the Smithsonian's Dr. A. Wetmore and Virginia's J. J. Murray provide Dean with some additional readings on ornithological history.

Brown sent the compilation, upon completion, to Dr. W. A. Murrell of the University of Florida.