Title: Sedʹmai͡a︡ (aprelʹskai͡a︡) Vserossiĭskai͡a︡ konferent͡s︡ii͡a︡ RSDRP(b)
Subjects: Congresses, Socialism, Sʺezd RSDRP(b) (6th : 1917 : Petrograd, R.S.F.S.R.), Sʺezd RSDRP(b) (6th : 1917 : Petrograd, R.S.F.S.R.) http://id.loc.gov/authorities/names/n85256714, Sʺezd RSDRP(b) (6th : 1917 Petrograd, R.S.F.S.R.)