Mathematics in geography 4 : the gravity model /
Mathematics in geography 4 : the gravity model /
prepared by the Continuing Mathematics Project, sponsored by the Schools Council and CET.
- York : Longman, 1978.
- 24 p. : ill. ; 30 cm.
Category 3
Mathematics--Study and teaching.
Mathematical geography--Study and teaching.
510.2491
Category 3
Mathematics--Study and teaching.
Mathematical geography--Study and teaching.
510.2491