The OP needs badly, like many here, to buy a copy of the late Geoffrey Boothroyd's, The Handgun, Crown Publishers, 1970.

He will learn the Colt info that any real handgunner needs to know and about most other pistols. I think this may be the most complete, well illustrated, book on handguns, from earliest times to ca. 1970. It's a big, thick book on good paper and worth the usually modest cost, and more. I've seen prices well under $20. You'd maybe expect more like $100!

Also of immense value is Haven & Belden's, A History of the Colt Revolver, 1836-1940. It includes Colt autos, too!