Popruzhenko, Mikhail Grigorievich (1854-1917).
The beginning of cosmography (mathematical geography). Moscow: the publication of the bookstore of V. V. Dumnov, under the firm Heirs of Br. Salaev, 1894.
Strelbitsky, Ivan Afanasyevich (1828-1900).
Calculation of the surface of the Russian Empire in its general composition in the reign of Emperor Alexander II. Category: Sankt Petersburg. Imp. acad. Sciences, 1874.