TY  - BOOK
AU  - Marks, John L.
AU  - Purdy, C. Richard
TI  - THINKING ABOUT PROBABILITY
U1  - 519.1 
PY  - 1963///
CY  - Boston
PB  - Ginn
KW  - Probabilities
N1  - Material For Use In Conjunction With Arithmetic We Need, Grades 7 And 8, And Ginn Texts For General Mathematics, Grade 9; Unnumbered Loose Sheets In Packet. Ginn Enrichment Program
ER  -