R.S.F.S.R.) Petrogradskai͡a gubernskai͡a konferent͡sii͡a professionalʹnykh soi͡uzov (1st 1919 Leningrad

• Pervai︠a︡ Petrogradskai︠a︡ gubernskai︠a︡ konferent︠s︡ii︠a︡ professionalʹnykh soi︠u︡zov i fabrichno-zavodskikh komitetov, 11-13 sent. 1919 g.