TY  - BOOK
AU  - Clatworthy, Willard H. 
TI  - Contributions on partially balanced incomplete block designs with two associate classes 
T2  -  Applied Mathematics Series. 47
U1  - 311.2 21st ed. 
PY  - 1956///
CY  - Washington: 
PB  - Department of Commerce
KW  - Mathematical statistics
KW  - Experimental design
ER  -