Hartree, Douglas.
Urbana: University of Illinois Press, 1949.  Large octavo, 138 pages. First edition, first printing of what is considered one of the two foundational works on computers (along with Berkeley's Giant Brains or Machines That Think).  Very light foxing to edges of text block, otherwise a very good copy in publisher's rust-colored cloth. In a complete dust jacket, with a three-inch closed tear to the front panel. Scarce in such handsome condition. [Goldstine page 99, Randell page 136].  
sold -
Calculating Instruments and Machines.