TY  - BOOK
AU  - Levy,Lester S.
AU  - Sampson,Roy J.
TI  - American economic development : growth of the U. S. in the western world
U1  - 338.973 LEV S 
PY  - 1962///.
CY  - Boston : 
PB  - Allyn, 
KW  - Economic development
KW  - Scientific method
ER  -