TY  - GEN
AU  - Smart,W.M
TI  - The origen of the earth
U1  - 082 21
PY  - 1955///
CY  - New York
PB  - Penguin Books
KW  - SISTEMA SOLAR
KW  - DESCRIPCION
KW  - TIERRA
KW  - ESTRUCTURA INTERNA
N1  - General description of the solar system, of the earth and of the noon and planets
ER  -