There is a great show on Houston's 55 KTBU called Postcards from Texas. It is a local show that spotlights the area's history and is a very well done show. Here is one segment the show produced about Houston baseball. The Astros weren't the first Major League Baseball team in Houston. That was the Colt .45s. Postcards from Texas looks at the team's early days in the Bayou City.
The Colt .45s: Major League Baseball Comes To Houston, Part 2