TY  - BOOK
AU  - Terry,George S.
TI  - The dozen system: an easier method of arithmetic
AV  - QA141 .T39
U1  - 511.2 
PY  - 1941///
CY  - London, New York
PB  - Longmans Green
KW  - Numeration
KW  - Local
N1  - Reproduced from type-written copy; Paged by the dozen system; "Duodecimal protractor reading .002 circle" and table laid in
ER  -