| source details = Saint Petersburg, editor M. Katkov, pp. 1-51
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| publication date =
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| publication date = 1880-04-01
| original date =
| original date =
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| notes =
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| notes = Letters 10-19 published separately in brochure and pasted here without any comment. Letter X on pages 3-9; XI on 9-11; XII on 11-15; XIII on 15-18; XIV on 18-23; XV on 23-30; XVI on 30-34; XVII on 34-37; XVIII on 37-45; XIX (mistyped as XVIII) on 45-54