TY  - BOOK
AU  - Roberts,J.M.
TI  - Different worlds
U1  - 909 19
PY  - 1980///
CY  - Harmondsworth, Middlesex, New York, N.Y.
PB  - Penguin, Distributed in the U.S. by Longman
KW  - Civilization
KW  - History
KW  - Juvenile literature
N1  - Includes index
UR  - http://www.archive.org/details/differentworlds00robe
UR  - http://www.openlibrary.org/books/OL24375948M
ER  -