TY  - BOOK
AU  - Polsby,Nelson W
TI  - How Congress evolves: social bases of institutional change 
SN  - 0195161955
AV  - JK1319 .P64 2004
U1  - 328.7307 22
PY  - 2004///
CY  - Oxford, New York
PB  - Oxford University Press
ER  -