Timeline Stories – Page 30 – Computer Timeline
How valve-maker millionaire Michael lets off some steam
Millionaire Calculating Machine National Museum of American History
Breaking the Nazis' Enigma codes at Bletchley Park (photos) - CNET
Two US companies set sights on the moon
Mechanical calculator - Wikipedia
Millionaire Calculator Machine Explained - Everything You Need To
Slide Rules & Calculators — The National Museum of Computing
National Museum of American History
Hidden Figures by Margot Lee Shetterly - Ebook
Millionaire Calculating Machine National Museum of American History
Origin of Modern Calculating Machines, by J. A. V. Turck—A Project
Wesleyan's Observatory To Celebrate 100th Anniversary – Hartford
Who Was Madam C.J. Walker? How Much Was She Worth?
Astronomy – History of Science & Technology at Peabody Museum