Improvements in forest growth on peat-bog soils of the U.S.S.R. forest zone and tundra. : Materialy po izucheniyu lesorastitel'nykh uslovii na torfyano-bolotnykh pochvakh lesnoi zony i v tundre - Pʹi͡avchenko, N. I. (Israel Program for scientific Translations; [available from the United States Department of Commerce, Clearing-house for Federal Scientific and Technical Information, Springfield, Va., 1965)