NYPL Digital Library - includes thousands of images from prints, books, and historical maps published in Russia and adjacent areas between 1730 and 1935. Most notably, includes the several series issued by 19th-century collector and scholar, Dimitrii Aleksandrovich Rovinskii. Special collections include:
Russia and Eastern Europe in rare photographs, 1860-1945
Posters of the Russian Civil War
Inventory of Slavic, East European, and Eurasian Digital Projects