TY  - BOOK
AU  - Blackwood,Paul E.
AU  - Hayes,William D.
TI  - Push and pull: the story of energy 
U1  - 530 23rd.ed.
PY  - 1961///
CY  - London
PB  - John Murray
KW  - Power (Mechanics)
KW  - Juvenile literature
KW  - Machinery
KW  - Energy
N1  - Includes bibliographical references and index
ER  -