TY  - BOOK
AU  - Cook,Thomas D
AU  - Campbell,Donald Thomas
TI  - Quasi-experimentation : : design & analysis issues for field settings 
SN  - 0395307902 
AV  - QE26 .B15
U1  - 519.54 
PY  - 1979///
CY  - Boston : 
PB  - Houghton Mifflin
KW  - 	 Social sciences -- Research
KW  - Paleontology
KW  - Geology
KW  - Great Britain
ER  -