TY  - BOOK
AU  - Rob nagel,
TI  - Encyclopedia of Science .
SN  - 0-7876-5441-8
AV  - Q121.U18 2001 7312
PY  - 2001///
CY  - china
PB  - U.X.L an imprint  of  the gale group
KW  - 1.Science-Encyclopedia,Juvenile 2.Technology-Encyclopedia,,Juvenile
N1  - includes bibliographical references and index
ER  -