Forecasting seed crops and determining cone ripeness in southwestern ponderosa pine
By: W.J. Rietveld.
Contributors: Rocky Mountain Forest and Range Experiment Station (Fort Collins, Colo.)
Series: General technical report RM -- 50.
Publisher: Rocky Mountain Forest and Range Experiment Station, Forest Service, U.S. Dept. of Agriculture
Published: 1978
Place of publication: [Fort Collins, Colo.]
Language: eng
Number of pages: 12
Subjects: Ponderosa pine -- Southwestern States; Pine cones -- Southwestern States -- Sampling; Forest regeneration -- Southwestern States; Ponderosa pine -- Southwestern States -- Seeds
Notes: "January 1978."

Bibliography: p. 11-12.