Duff, Charles

All purposes French for adults Duff, Charles 1978 French for beginners Duff, Charles 1955 German for beginners Duff, Charles 1960 German for Beginners Duff, Charles 1960 How to learn a language Duff, Charles 1948 Spanish for beginners Duff, Charles 1958 The basis and essentials of German Duff, Charles Year not listed The basis and essentials of Russian Duff, Charles Year not listed This Human Nature Duff, Charles 1950 This Human Nature Duff, Charles 1950