 | Alexander, Robert R. cn | (2) |
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 | Alexander, Robert R. cn; Seedfall and establishment of Engelmann spruce in clearcut penings : a case history / by Robert R. Alexander. Fort Collins, Colo. : Rocky Mountain Forest and Range Experiment Station, Forest Service, U.S. Dept. of Agriculture, 1969. | |
| Alexander, Robert R. cn; Site indexes for lodgepole pine, with corrections for stand density : methodology / by Robert R. Alexander, David Tackle, and Walter G. Dahms. Fort Collins, Colo. : Rocky Mountain Forest and Range Experiment Station, Forest Service, U.S. Dept. of Agriculture, 1967. | |
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