Hard years (1876-1880)

Gradovsky, Alexander Dmitrievich (1841-1889).Hard years (1876-1880): essays and experiments / [cit.] A. Gradovsky, prof.S.-Petersburg.un-ta.- St. Petersburg: Type.MM.Stasyulevich, 1880. -VIII, 460 p.;21 cm - -Bibliogr.in a substrateNote..1. Power (collection).Electronic Source: PBOriginal Storage Place: SPbSU