TY  - BOOK
AU  -  Johnson,Donovan A.
AU  -  Glenn,William H.
TI  -  Exploring mathematics on your own : :  understanding numeration syst ems / 
U1  -  510 JOH 
PY  - 1961///
CY  -  London : 
PB  -  John Murray, 
KW  -  Numerals
KW  -  Mathematical recreations
ER  -