Pruning wound healing on western white and ponderosa pines
By: by Austin E. Helmers
Series: Research note / Northern Rocky Mountain Forest & Range Experiment Station -- no. 45; Research note (Northern Rocky Mountain Forest and Range Experiment Station (Missoula, Mont.)) -- no. 45.
Publisher: Northern Rocky Mountain Forest and Range Experiment Station
Published: 1946
Place of publication: Missoula, Mont
Language: eng
Subjects: Pine; Pruning
Notes: Caption title.

"December 20, 1946."