TY  - BOOK
AU  - Grant,Eugene Lodewick
AU  - Ireson,William Grant
TI  - Principles of engineering economy / 
U1  - 620.004 GRA 
PY  - 1970///
CY  - New York : 
PB  - Ronald Press , 
KW  - Engineering economy
N1  -  Includes bibliography: p. 629 - 633
ER  -