Not sure about the 1987 sampler tape, however, the songs on the tape were surely taken from the original recordings made by Cazden, Studer & Haufrecht for Camp Woodland, which seem to be housed in several locations, including:

Indiana University Archive of Traditional Music (which also has some recordings made by Herb Halpert in 1939 & 1941 in some of the same areas of the Catskills, pre-Camp Woodland!). http://www.indiana.edu/~libarchm

The American Folklife Center at the Library of Congress, Washington DC: http://www.loc.gov/folklife/guides/findaid-topical.html (see New York collections)

M.E. Grenander Department of Special Collections and Archives
University at Albany, SUNY, LE-355
1400 Washington Avenue
Albany, New York 12222
518-437-3934
http://library.albany.edu/speccoll/

The tapes at Albany (from the Norman Studer archive) are in such fragile condition that it has been recommended they only play them one more time, in the transfer to digital. Unfortunately, funding for such a project seems to be at least a few years away.