S2In view of this continued emphasis on site and seedbed, a direct-seeding study involving five species on two sites was begun in the fall of 1958 in southwestern Maine. The intent was to gather some preliminary information, by species, about the influence of soil type and seedbed-preparation measures on initial seedling establishment.S3

S2The authors have attempted to include in this bibliography all articles that contain significant original information about pitch pine or that are comprehensive review; Secondary sources, such as textbooks that briefly review the literature on specific subjects, are omitted. Articles on local floras are included only if they provide new, revised, or more detailed information about the distribution or abundance of pitch pine.S3.

S2Work carried out by the Northeastern Forest Experiment Station in West Virginia in the past 12 years provides useful information about the relationships between tree d.b.h. and butt-log grade. The upper logs are not included in the relationships. Being smaller and containing more knots, these upper logs are generally of lower grade than the butt logs. Thus the average grade of all material in the sawlog portion of the tree is generally lower than the average grade of the butt log. In the West Virginia data, species differences in d.b.h.-grade relationship are readily apparent. This inherent tendency for species to have different proportions of the various grades in logs of the same size is a familiar phenomenon to grade-conscious foresters who work with hardwoods. The results in this paper provide a quantitative evaluation of this tendency for six of the local species.S3.