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1.
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Clone expansion and competition between quaking and bigtooth aspen suckers after clearcutting / y Donald A. Perala by Series: USDA Forest Service Research paper ; NC-201
Material type: Text Text; Format: print ; Literary form: Not fiction
Language: English
Publication details: Washington,D.C : North Central Forest Experinmental Station, 1979
Availability: Items available for loan: National Library of India (1)Call number: U.S 571.89 P 411 c.

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2.
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Regeneration and productivity of aspen grown on repeated short rotations / Donald A. Perala by
Material type: Text Text; Format: print ; Literary form: Not fiction
Language: English
Publication details: Washington, D.C. : U.S. Dept. of Agriculture, 1979
Availability: Items available for loan: National Library of India (1)Call number: US 634.9.

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3.
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Thinning Strategies for aspen : a prediction model/ Donald A. Perala by
Material type: Text Text; Format: print ; Literary form: Not fiction
Language: English
Publication details: Washington : United States Department of Agriculture, 1979
Availability: Items available for loan: National Library of India (1)Call number: U.S 583.650973 P 411.

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4.
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A provisional assessment of triclopyr herbicide for use in lake states forestry / Donald A. Perala by
Material type: Text Text; Format: print ; Literary form: Not fiction
Language: English
Publication details: Washington, D. C. : United States Government Printing Office, 1980
Availability: Items available for loan: National Library of India (1)Call number: U.S 632.95042 P 41.

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