References in periodicals archive ?
Explorers discussed include Ermak Timofeev, Vasilii Danilovich Poiarkov, Erofei Pavlovich Khabarov, Semen Ivanovich Dezhnev, Aleksei Chirikhov, Nikolai Nikolaevich Miklukho-Maklai, Petr Petrovich Semenov-Tian-Shanskii, and Valentina Tereshkova.