TY  - BOOK
AU  - Ellerby,G.
TI  - Graphic and calculas
U1  - 311.26 
PY  - 1964///
CY  - London
PB  - Pergamon
KW  - Statistics
KW  - Graphic methods
KW  - Graduation
KW  - Frequency curves
N1  - Includes index
ER  -