Tolong jelaskan mengenai Catatan dari Sergey Stepnyak-Kravchinsky

The World That Never Was: A True Story of Dreamers, Schemers, Anarchists & Secret Police, Alex Butterworth, first edition, page 92.

S. M. Stepniak-Kravchinskii: The London Years. [Senese, Donald] /Newtonville -ORP- 1987/, pp. 130, ill. hc.