TY  - BOOK
AU  - Jahn,Lora Dolores
AU  - Jahn,Lora Dolores
TI  - Mathematics in action: book two 
U1  - 510 23η
PY  - 1939///
CY  - Boston
PB  - D. C. Heath and Company
KW  - Μαθηματικά
ER  -