Correspondence and papers from Russia on Luna 16 and 20, collected by Colin Pillinger Correspondence regarding English translations of the Russian volume published on Luna 16 for the use of Principle Investigators, and scientific papers from Russia in both Russian and English translation on Luna 16 and 20. Includes Jean Agrell's translation of 'Preliminary data on lunar soil obtained by automatic station "Luna-20"' by A.P. Vinogradov, 1972. Eight journal articles are in Russian, with the following translated into English: 'The relationship between lunar crater morphology and crater size,' C.P. Florensky, A.T. Basilevsky and N.N. Grebennik 'The role of vaporization processes in lunar rock formation,' A.V. Ivanov and K.P. Florensky 'Chondrule-like particles from Luna 16 and Luna 20 regolith samples' A.V. Ivanov, M.A. Nazarov, O.D. Rode and I.D. Shevaleevski 'Comparative characteristics of regolith samples delivered from the lunar mare and highland regions by the automatic stations Luna 16 and Luna 20' A.V. Ivanov, L.S. Tarasov, O.D. Rode and K.P. Florensky Correspondents: P. Wigley, The Royal Society Dr Yu. I. Belyaev, V.I. Vernadsky Institute of Geochemistry and Analytical Chemistry Professor Colin Trevor Pillinger, University of Bristol Mrs Francis Waranius, NASA John H. Pomeroy, NASA Professor Geoffrey Eglinton, University of Bristol Dr R.O. Pepin, NASA T.C. Gibb, School of Chemistry, University of Leeds Dr K.P. Florenskij, V.I. Vernadsky Institute of Geochemistry and Analytical Chemistry Dr R.O. Pepin, NASA November 1972-3 March 1975