Judging ripeness of seeds in Black Hills ponderosa pine cones
By: James L. Van Deusen and Lawrence D. Beagle.
Contributors: Beagle, Lawrence D.; Rocky Mountain Forest and Range Experiment Station (Fort Collins, Colo.)
Series: USDA Forest Service research note RM -- 235.
Publisher: Rocky Mountain Forest and Range Experiment Station, Forest Service, U.S. Dept. of Agriculture
Published: 1973
Place of publication: Fort Collins, Colo
Language: eng
Subjects: Ponderosa pine -- Seeds -- Viability -- Black Hills (S.D. and Wyo.); Ponderosa pine -- Seeds -- Harvesting.
Notes: Caption title.

Includes bibliographical references (p. 4).