Columbia subject headings:
Harvard subject headings:
Agriculture--Research--Soviet Union--History.
Agriculturists--Soviet Union--Biography.
Bolotov, Andreĭ Timofeevich, 1738-1833.
Princeton subject headings:
Bolotov, Andreĭ Timofeevich, 1738-1833--Contributions in agriculture.
Historians--Soviet Union--Biography.
Intellectuals--Soviet Union--Biography.