TY  - BOOK
AU  - Hughes,Thomas Parke
TI  - Elmer Sperry: inventor and engineer 
SN  - 0801847567
PY  - 1971///
CY  - Baltimore, Md.
PB  - The Johns Hopkins University Press
KW  - Sperry, Elmer Ambrose, 1860
N1  - p. 341-342
ER  -