TY  - BOOK
AU  - Walker, Colin
TI  - What our earth is made of
SN  - 0-8136-7301-1
AV  - BB 552 W34 1993
PY  - 1993///
CY  - Celveland, Ohio
PB  - Modern Curriculum Press
KW  - Sciences
KW  - Earth
ER  -