Internal defects associated with pruned and nonpruned branch stubs in black walnut
Subtitle: by Alex L. Shigo ... [et al.].
Contributors: Shigo, Alex L., 1930-; Northeastern Forest Experiment Station (Radnor, Pa.)
Series: Research paper NE -- 440.
Publisher: Forest Service, U.S. Dept. of Agriculture, Northeastern Forest Experiment Station
Published: 1979
Place of publication: Broomall, Pa
Language: eng
Number of pages: 27
Subjects: Eastern black walnut -- Pruning
Notes: "ODC 245.1 (416.5)"

Bibliography: p. 3.