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Triangular Open Divided Scale Signed William Minifee
Sheets, Index to Marchant Methods
Marchant Calculators, Correspondence on Historical Topics
Sheets, The Strange Life of Charles Babbage
General Electric J31 Turbojet Engine, Cutaway, Motorized
[Trade catalogs from Westinghouse Electric & Mfg. Co.]
[Trade catalogs from Quimby Pump Co., Inc.]
[Trade catalogs from Baldwin Locomotive Works]
[Trade catalogs from Rebikoff Underwater Products, Inc.]
Human Exploration: The Journey Continues. Part 2 - Dreams of Generations Realized
gas engine magneto with impulse starter
Corps of engineers—Simmons chapter on archaic of Southwest
13E. Comments by Corps of Engineers on Davis and Simmons' performances on contracts arranged through Irwin-Williams 1986-88, memo by Irwin-Williams on travel vs. on time contract delivery
13F. Reviewer comments on Simmons, Corps of Engineers report and evaluation revisions
[Historic American engineering record documentation of three dams in central Arizona]
Arkansas archaeological survey