Cortina's Russian in 20 lessons : intended for self-study and for use in schools / With a simplified system of pronunciation by Alfred Senn and Andrey A. Rozhdestvensky. Russian in 20 lessons. Senn, Alfred, 1899- Rozhdestvensky, Andrey A., joint author. Russian language Conversation and phrase books. 491.7 COR First ed. published in 1951 under title: Cortina's Russian conversaphone. New York : R.D. Cortina Co.; distributors: Garden City Books, Garden City, N.Y., 1957. 1957. 1957 Text 444 p. ; rus