1964. Second Revised Edition. 81 pages. Illustrated dust jacket over patterned paper covered boards. Text is in Russian with English notes. Pages are moderately tanned and occasionally foxed throughout. Minor pencil marking to front free end-paper. Binding remains firm. Boards have mild edge-wear with slight rubbing to surfaces. Mild crushing to spine ends. Book has a slight forward lean. Unclipped jacket has light edge-wear with tears and creasing.