Since 1957 he has written or co-authored over 25 books on geography.

She wrote several textbooks throughout her lifetime, including books on history and geography.

During this period he wrote a number of textbooks on geography.

He also produced other important work on political, economic and urban geography.

Like all plans based on geography, it was put together using a map.

Humans tended to look more at the influence of history on geography.

He also wrote his first paper on urban social geography during that time.

He is famous for his work on astronomy and geography.

This eliminated the old system, which was based on geography.

He also published several works on geography and history of the American continent.