Ob ispol'zovanii sosovykh semennykh nasazhdenijj na territorii Okruzhnogo Upravlenija Gosudarstvennykh Lesov v g. Sedl'ce za perod c 1965/1966 po 1969/1970 g.
EN
About the utilization of pine seed stands on the territory of the State Forest Administration Siedlce in the period 1965/66-1969/70