Title: Hokuhen no kaitakusha
Subjects: Explorers, Biography, Discovery and exploration
Places: Hokkaido (Japan), Soviet Union, Japan, Amur River Region (China and Russia)
People: Tokunai Mogami (1754 or 1755-1836), Gennadiĭ Ivanovich Nevelʹskoĭ (1813-1876)