** Letter in answer from M. N. Katkov to H. P. Blavatsky <span style="color: grey;">(27 of April 1884, Moscow, Russia)</span>
** Letter in answer from M. N. Katkov to H. P. Blavatsky <span style="color: grey;">(27 of April 1884, Moscow, Russia)</span>
** Letter from P. S. Grachev to Thakur-Sahib <span style="color: grey;">(14 of March 1890, Kungur, Russia)</span>
** Letter from P. S. Grachev to Thakur-Sahib <span style="color: grey;">(14 of March 1890, Kungur, Russia)</span>
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== See also ==
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* [https://www.gutenberg.org/files/6687/6687-h/6687-h.htm From the Caves and Jungles of Hindostan] – the original translation and edition by V. V. Johnston.