Title: Vlii︠a︡nie ėnergosberegai︠u︡shchikh obrabotok i spet︠s︡ializirovannykh sevooborotov na urozhaĭnostʹ polevykh kulʹtur i plodorodie pochv Severo-Zapada RSFSR
Subjects: Crop rotation, Soil fertility, Crop yields, Northwestern Soviet Union, Fertilizers, Plowing
Places: Northwestern Soviet Union