Columbia subject headings:
Harvard subject headings:
Geographers--Soviet Union--Biography
Kropotkin, Petr Alekseevich, kni︠a︡zʹ, 1842-1921
Princeton subject headings:
Geographers--Russia--Biography.
Kropotkin, Petr Alekseevich, kni︠a︡zʹ, 1842-1921.
Siberia (Russia)--Discovery and exploration.