Columbia subject headings:
Harvard subject headings:
Ocean
Shokalʹskiĭ, I︠U︡. M. (I︠U︡liĭ Mikhaĭlovich), 1856-1940.
Princeton subject headings:
Ocean.
Shokalʹskiĭ, I︠U︡. M. (I︠U︡liĭ Mikhaĭlovich), 1856-1940.