William L. Finley's papers primarily document his work as a wildlife conservationist, author, lecturer, photographer, and filmmaker from about 1900 to 1940. The collection also documents the work his wife Irene Finley and photography partner Herman Bohlman. The collection consists of published and unpublished manuscripts, lecture and field notes, reports, correspondence, photographs and motion picture films.

An addition to the collection (Accession 2014:062) is made up of correspondence and newspaper clippings documenting the wildlife conservation work of William and Irene Finley. Among the topics addressed in the correspondence include: song bird protection laws in Oregon, requests to Finley for use of his photographs, the forming of an Oregon Fish and Game Commission, biological surveys conducted by Finley, legislation in California repealing meadowlark protection, and letters by Finley to various organizations regarding the presentation of one of his lectures. A highlight among the correspondence is a thank you letter from Finley to President Theodore Roosevelt for his establishment of wild bird reservations. The clippings are newspaper articles written by Irene and William Finley about encounters with wildlife, nocturnal bird sounds, and their filming of wildlife at Paulina Lake. The four articles all appeared in editions of the "Oregon Sunday Journal."