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Teeri JA.  1992.  The soil biotron: an underground research laboratory. Inventive Minds: Creativity in Technology. :142-153.
Foster WL, Jr. JLTate.  1966.  The activities and coactions of animals at sapsucker trees. Living Bird. 5:87-113.
Rowe AH.  1966.  Sonic testing to detect decay in trees. School of Natural Resources. Master of Forestry:55pp..
Zahner R, Crawford NArnold.  1964.  The clonal concept in aspen site relations. Proceedings of the Second North American Forest Soils Conference.