TY  - BOOK
AU  - Northrop,Eugene P.
TI  - Riddles in mathematics: a book of paradoxes
AV  - QA95 .N6
U1  - 510.76 
PY  - 1944///
CY  - New York
PB  - D. Van Nostrand company, inc.
KW  - Mathematical recreations
KW  - Local
N1  - "Notes and references": p. [245]-254
ER  -