TY  - BOOK
AU  - Hartree, Douglas Rayner
TI  - CALCUATING INSTRUMENTS IN MACHINES
U1  - 510.8 
PY  - 1950///
CY  - Cambridge
PB  - The University Press
KW  - Calculating Machines
KW  - Mathematical Instruments
N1  - References : P. 131-134
ER  -