Forecasting seed crops and determining cone ripeness in southwestern ponderosa pine / W.J. Rietveld.
|Main Author:||Rietveld, W. J.|
[Fort Collins, Colo.] : Rocky Mountain Forest and Range Experiment Station, Forest Service, U.S. Dept. of Agriculture, 1978.
> Southwestern States.
Pine cones > Southwestern States > Sampling.
Forest regeneration > Southwestern States.
Ponderosa pine > Southwestern States > Seeds.
12 p. :
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