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see Groves, J. W. Jr., 1962. Edible and poisonous mushrooms of Canada. Publication 112, Research Branch Canada Dept. Agr., x + 298 pp.; see Hall, J. G. 1960. Willow and aspen in the ecology of beaver on Sagehen Creek, California. Ecology, 41(3):484-494.; see Keith, J. O. 1965. The Abert squirrel and its dependence on ponderosa pine. Ecology, 46(1&2):150-163.; see Lindsey, A. A., J. D. Barton and S. R. Miles, 1958. Field efficencies of forest sampling methods. Ecology, 39(3):428-444.; see Smith, R. H. 1964. Variation in the monoturpenes of pinus ponderosa laws. Science, 143(3612):1337-1338.