Columbia subject headings:
Harvard subject headings:
Authors, Russian--20th century--Biography
Environmental protection--Soviet Union
Prishvin, Mikhail Mikhaĭlovich, 1873-1954--Biography.
Princeton subject headings:
Authors, Russian--20th century--Biography.
Environmental protection--Soviet Union.
Prishvin, Mikhail Mikhaĭlovich, 1873-1954--Biography.