N. Sevryukov ... et al. ; tr. from the Russian by B. Kuznetsov. N. Sevryukov ... [et al.] ; tr. from the Russian by B. Kuznetsov. J. Leja. ; tr. from the Russian by E. Koltsova. N. Rykalin ; tr. from the Russian by O. Glebov. D. Klovsky, B. Nikolaev ; tr. from the Russian by Boris Kuznetsov. V. Alexeyev ; tr. from the Russian by E. Uuarov. I. Muravyov ... et al. ; tr. from the Russian by A. Gurevich. M. Khetagrov ; tr. from the Russian by N. Weinstein. I. Muravyov ... [et al.] ; tr. from the Russian by A. Gurevich. A. Betekhtin ; tr. from the Russian by V. Agol.