Prominent Russian theorist of narodism, philosopher, publicist, and sociologist (1823-1900) who endorsed revolutionary socialist ideals. Two ALSs in Cyrillic, signed "P. Lavrov," each one page on a postcard, one 3.5 x 5.5 and the other torn to 3.5 x 3.5, dated 1897 and 1899. Both untranslated and sent to the Russian revolutionary, journalist, and writer Felix Volkhovsky. Aforementioned tear to one postcard, and scattered creases, otherwise fine condition. Accompanied by an unsigned photo of Lavrov on his deathbed, a letter by journalist Nathan Golant, and one additional contemporary letter.