Duodecimal system

Duodecimal arithmetic

[by] George S. Terry.

Duodecimal arithmetic

[by] George S. Terry.

Numerandi methodi, sive, Arithmeticae omnes possibiles: e quibus cum dyadica consequentes plurimae usque ad duodenariam evolvuntvr, ad caeteras eruendas regula generalis

exhibetur auctore Christoph. Frideric. Vellnagel ...

Mathamerica: and key to the American dozen system of mathematics ...

Grover Cleveland Perry

An excursion in numbers

F. Emerson Andrews

Duodecimal arithmetick: viz. Notation. Addition. Subtraction. Multiplication. Division. Reduction. Extraction of the-square, and cube roots. Rule of proportion-direct, and reverse. Duodecimally performed, and very practically applied to the measuring of all sorts of superficies, and solids, as board, glass, &c. timber, stone, &c. But chiefly to the ganging [sic] of all sorts of brewers tuns and casks, to find the whole content, or the vacuity or remaining liquor of either, and that with more ease and expedition, than by vulgar or decimal arithmetick. Very useful for all sorts of men, aswel [sic] gentlemen as others, but especially for merchants, writing masters, and all measuring artificers. And all the rules made plain, and easie for the meanest capacity

Joshua Jordaine

Manual of the dozen system: a collation of material from many sources, presenting the number system, the arithmetic and the measures of the twelve-base, and the current practices for using that base most conveniently.

Duodecimal Society of America.

The dozen system: an easier method of arithmetic

[by] George S. Terry

Douze notre dix futur: essai sur la numération duodécimale et un système métrique concordant.

Préf. de Albert Caquot.

An excursion in numbers

Frank Emerson Andrews