TY  - BOOK
AU  - Beauchamp,Wilbur L.
AU  - Crampton,Gertrude
AU  - Gray,William S.
TI  - How do we know?
PY  - 1945///
CY  - Chicago
PB  - Scott, Foresman and Co.
KW  - Science
KW  - Juvenile literature
ER  -