Internal defects associated with pruned and nonpruned branch stubs in black walnut /
by Alex L. Shigo ... [et al.].

APA Citation

Shigo, A. L., Northeastern Forest Experiment Station (Radnor, P. (1979). Internal defects associated with pruned and nonpruned branch stubs in black walnut: by Alex L. Shigo ... [et al.]. Broomall, Pa. (370 Reed Road, Broomall, Pa. 19008): Forest Service, U.S. Dept. of Agriculture, Northeastern Forest Experiment Station.

MLA Citation

Shigo, Alex L., 1930-, and Pa.) Northeastern Forest Experiment Station (Radnor. Internal Defects Associated With Pruned And Nonpruned Branch Stubs In Black Walnut: by Alex L. Shigo ... [et Al.]. Broomall, Pa. (370 Reed Road, Broomall, Pa. 19008): Forest Service, U.S. Dept. of Agriculture, Northeastern Forest Experiment Station, 1979.