TY  - BOOK
T1  - Practical charting techniques
A1  - Spear, Mary Eleanor
PP  - New York
PB  - McGraw-Hill
YR  - 1969
UL  - https://tuklas.up.edu.ph/Record/UP-8027390931312316040
OP  - 394
CN  - HA31 S75
KW  - Statistics : Graphic methods.
ER  -