Describes the characteristics of the two planets closest to the sun and their relationship to the earth.
- ISBN10 0531007650
- ISBN13 9780531007655
- Publish Date 1 January 1972
- Publish Status Out of Print
- Out of Print 10 May 2014
- Publish Country US
- Imprint Franklin Watts
- Format Hardcover
- Pages 68
- Language English