Funded by the National Science Foundation PEET program (Partnerships for Enhancing Expertise in Taxonomy)
Smith, R. H. 1966c. Resin quality as a factor in the resistance of pines to bark beetles. NATO/NSF Symposium on breeding pest-resistant trees, Pennsylvania State University, 30 August-11 September 1964. Pergamon Press, New York. 1964:189-196.