○合衆国の木本植物のタネ, Forest Service, USDA : Seeds of Woody Plants in the United States. Agriculture Handbook No.450,viii+883,図(含白黒写真)592葉, 表453葉, カラー写真54葉, U.S.Government Printing Office, Washington, D.C., 1974,$13.60.

Data up to Jan 2025