Copes, Donald L. Effects of Water Suspension and Wet-Dry Cycling on Fertility of Douglas-Fir Pollen / Donald L. Copes, Nan C. Vance. -- Portland : USDA Forest Service, 2000. -- 9 s. : obr., tab. ; 28 cm. -- (Research Note ; PNW-RN-527). -- (brož.) : .00

I. Vance, Nan C.

581.331.2+630*174.7
ZV001