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作者	Isaac, Leo A. (Leo Anthony), 1892-1970.

標題 Factors affecting establishment of Douglas fir seedlings / by Leo A. Isaac.

出版資料	Washington, D.C. : U.S. Dept. of Agriculture, 1938.

說明	46 p. : ill. ; 23 cm.
系列	Circular / United States Department of Agriculture ; no. 486
	Circular (United States. Department of Agriculture) no. 486.
Notes	Caption title.
	"Contribution from Forest Service."
With:	Bound With: Rules and recommendations for testing seeds.
Bibliography	Includes bibliographical references.
主題	Douglas fir -- Seedlings.
政府出版物號碼	A 1.4/2:486