Stencils for Solving x2=a(modm) calculating stencils
University of California Press
IBM number printed on all cards
in box: 3 3/8 in x 8 in x 2 5/8 in
Object consists of hundreds of stencils with various parameters for calculations including different "exclusion modulus" numbers, different quadratic characters of "m" and different value of "a/m." Also included is a manual. The manual mentions that the stencils are made on Hallerith cards.