Trans-Caspian region

  Kuropatkin, Alexey Nikolaevich (1848-1925).     Turkmenistan and Turkmens.
St. Petersburg: Type. V. A. Poletyki, 1879.

РГБ

  Shcherbak, Alexander Viktorovich (1850-1894).     Akhal-Tekin expedition of General Skobelev in 1880-81.
St. Petersburg: Type. V.V. Komarova, 1900.

РГБ