Title: Poludennai︠a︡ nochʹ, polunochnoe solnt︠s︡e
Subjects: Diaries, Explorers, Scientific expeditions, Sources, History, Discovery and exploration, Russian
Places: North Pole
People: P. G. Kushakov, G. I︠A︡ Si︠e︡dov (1877-1914)
Time periods: 20th century