This refers to the report of the Breslau Congress of the German Social-Democratic Party held in 1895. The correspondence from abroad was sent in the binding of a book.
This refers to the illegal printing-press of the young Narodnaya Volya group, organised in January 1895. Lenin negotiated with this group for the purpose of using the press for the publication of literature for the workers. In November 1895 Lenin's pamphlet Explanation of the Law on Fines Imposed on Factory Workers (see present edition, Vol. 2) was handed over to this group for printing. This is the fourth thing ("one of ours") which Lenin refers to.
This refers to Rabocheye Dyelo (Workers' Cause ), which was being prepared by the St. Petersburg League of Struggle for the Emancipation of the Working Class. The first number of this newspaper was compiled and edited by Lenin, who also wrote all the main articles: the editorial "To the Russian Workers", "What Are Our Ministers Thinking About?", "Frederick Engels" (see present edition, Vol. 2). In addition the newspaper contained articles by other members of the St. Petersburg League of Struggle, such as G. M. Krzhizhanovsky, A. A. Vaneyev, P. K. Zaporozhets, L. Martov (Y. O. Tsederbaum) and M. A. Silvin.
In his book What Is To be Done? Lenin wrote: "This issue was ready to go to press when it was seized by the gendarmes, on the night of December 8, 1895, in a raid on the house of one of the members of the group, Anatoly Alexeyevich Vaneyev, so that the first edition of Rabocheye Dyelo was not destined to see the light of day" (see present edition, Vol. 5, p. 376).