TY  - GEN
TI  - McGraw-Hill encyclopedia of science & technology vol.20
SN  - 0079092063
U1  - 503 
PY  - 1992///
CY  - New York
PB  - McGraw-Hill
KW  - Encyclopedia - Science & Technology
N1  - An internatioanl reference work in twenty volumes including an index
ER  -