Houston MLB team changes from Colt .45s to Astros on Dec. 1, 1964

Happy 50th, Houston Astros — formerly 'Colt .45s,' almost 'Stars

Houston Astros Wear Throwback Colt .45s Jerseys on Team's 50th Anniversary, News, Scores, Highlights, Stats, and Rumors

Don Bradey – Society for American Baseball Research

When the Colt .45s became the Astros and the origins of other Houston sports team names

Houston Colt 45's - This Day In Baseball

The Houston Colt .45s Baseball Club 1962-1964

Beaumont grad, former Astros player follows team with special appreciation

Colt .45s: Which MLB team was formerly known as the Colt .45s?

When the Colt .45s became the Astros and the origins of other Houston sports team names