Powells, H. A., and R. W. Krauss. 



1959. The inorganic nutrition of loblolly pine and Virginia pine with special ref- 

 erence to nitrogen and phosphorus. For. Sci. 5:95-111. 

 Gashwiler, J. 



1971. Emergence and mortality of Douglas-fir, western hemlock, and western redcedar 

 seedlings. For. Sci. 17:230-237. 

 Hacskaylo, E., and A. G. Snow, Jr. 



1959. Relation of soil nutrients, and light to prevalence of mycorrhizae on pine 

 seedlings. USDA For. Serv., Northeast. For. and Range Exp. Stn., Stn. Pap. 125, 

 13 p. Upper Darby, Pa. 

 Harrington, M. G. 



1977. The response of ponderosa pine seeds to light. USDA For. Serv. Res. Note 

 INT-220, 8 p. Intermt. For. and Range Exp. Stn., Ogden, Utah. 

 Hermann, R. K. (ed.) 



1970. Regeneration of ponderosa pine: symposium proceedings. 126 p. Sch. For., 

 Oreg. State Univ., Corvallis, Sept. 11-12, 1969. 

 Kelsey, R. G., and M. G. Harrington. 



1979. A search for potential phytotoxins influencing germination and early growth of 

 ponderosa pine. USDA For. Serv. Res. Pap. INT- 216, 28 p. Intermt. For. and 

 Range Exp. Stn., Ogden, Utah. 

 Larson, M. M. 



1967. Effect of temperature on initial development of ponderosa pine seedlings. For 

 Sci. 13:286-294. 

 Larson, M. M. , and G. H. Schubert. 



1969, Root competition between ponderosa pine seedlings and grass. USDA For. Serv. 

 Res. Pap. RM-54, 12 p. Rocky Mt. For. and Range Exp. Stn., Ft. Collins, Colo. 



Lawrence, W. , N. Kverno, and H. Hartwell. 



1961. Guide to wildlife feeding injuries on conifers in the Pacific Northwest. 44 p 

 West. For. and Conserv. Assoc., Portland, Oreg. 

 Loewenstein, H. 



1970, Mineral nutrition and the drought resistance of ponderosa pine seedlings. In 

 Regeneration of ponderosa pine: symposium proceedings, p. 77-81, Sch. For., Oreg. 

 State Univ., Corvallis, Sept. 11-12, 1969. 



McDonald, P. M. 



1976. Inhibiting effect of ponderosa pine seed trees on seedling growth. J. For. 

 74:220-224. 



Meyer, W. H. 



1938. Yield of even-aged stands of ponderosa pine. U.S. Dep. Agric. Tech. Bull. 630 

 p. 59. 

 Pearson, G. A. 



1934. Grass, pine seedlings, and grazing. J. For. 32:545-555. 

 Pearson, G. A. 



1936. Some observations on the reaction of pine seedlings to light. Ecology 17: 

 270-276. 

 Pearson, G. A. 



1942. Herbaceous vegetation, a factor in natural regeneration of ponderosa pine in 

 the southwest. Ecol. Monogr. 12:318-338. 

 Pfister, R. D. , B. L. Kovalchik, S. F. Arno, and R. C. Presby. 



1977. Forest habitat types of Montana. USDA For. Serv. Gen. Tech. Rep, INT-34, 174 

 Intermt. For. and Range Exp. Stn., Ogden, Utah. 



Rietveld, W. J., and L. J. Heidmann. 



1976. Direct seedling ponderosa pine on recent burns in Arizona. USDA For. Serv. 

 Res. Note RM-312, 8 p. Rocky Mt. For. and Range Exp. Stn., Ft. Collins, Colo. 

 Roe, A. L. , and A, E. Squillace. 



1950. Can we induce prompt regeneration in selective-cut ponderosa pine stands? 

 USDA For. Serv., North. Rocky Mt. For. and Range Exp. Stn., Res. Note 81, 7 p. 

 Missoula, Mont. 



25 



