The I.B.M. Pluggable Sequence Relay Calculator. In: Mathematical Tables and Other Aids to Computation, Volume III, Number 23 (June, 1948), pp. 149-161.
A description of the special-purpose wartime punched-card calculators originally developed by IBM for the United States Army. Library rubberstamp on front wrapper. Very good. The complete issue, in original printed wrappers. Octavo. The first two machines of this type, were built during the war for the Aberdeen proving ground, were.....