Zelenin A N, Balovnev V I, . (1986). Machines for Moving the Earth. New Delhi: OXONIAN PRESS.
Zelenin A N, Balovnev V I, . 1986. Machines for Moving the Earth. New Delhi: OXONIAN PRESS.
Zelenin A N, Balovnev V I, . Machines for Moving the Earth. New Delhi: OXONIAN PRESS. 1986.