File:Vintage Bowmar Electronic Pocket Calculator, Model MX-50 (aka

Pocket Calculator Photo Gallery

Category:Calculator collection by Joe Haupt (from Flickr stream) - Wikimedia Commons

Bowmar MX100

File:Vintage Bowmar Electronic Pocket Calculator, Model MX-50 (aka 90505), Red LED Display, Sealed Battery, Made In USA, Circa 1973 (14775039801).jpg - Wikimedia Commons

Calculator Book Addendum J-O

Virtual Museum of Calculators

Pocket Calculator Photo Gallery

List Of Calculators In Adam's Ancient Computer Museum

Virtual Museum of Calculators

File:Vintage Texas Instruments Electronic Pocket Calculator, Model TI-2550 III, Made in USA, Circa 1976 (11980287214).jpg - Wikimedia Commons