Abstract:
New findings and archival materials on P N Lebedev, V I Vernadskii, P P Lazarev, S I Vavilov, L I Mandelstam, I E Tamm, M A Leontovich, A A Andronov and other scientists of their circle, as well as on the science philantropists Kh S Ledentsov and A L Shanyavskii, are presented, allowing a better insight into the history of science.