 The 200th Anniversary Album" or "The Album of Russian Fairytales and Bylinas" (1875) (the text provided by Pyotr Petrov, for both) became priced rarities.His "Katalog der wichtigeren, hervorragenden und besseren Schriften deutscher Literatur, welche in den Jahren 1801 bis Ende 1868 erschienen sind" written in German, has been described as 'unique'.Hoppe was one of the founders of the Russian Society of Booksellers and Publishers (Русское Общество книгопродавцев и издателей) which published "Knizhny Vestnik" (Books' Herald) in 1884—1916.