Sketches of Mars during the 1971 opposition by Gérard de Vaucouleurs

Sketches of Mars during the 1971 opposition by Gérard de Vaucouleurs
Sketches of Mars during the 1971 opposition by Gérard de Vaucouleurs From "The Complete Sky & Telescope: Seven Decade Collection" Sky & Telescope, November 1971, p. 263