how can i find out info on a old colt super 38 semi auto
Here is a link to Vincent Lewis' site for starters.
http://www.vincelewis.net/38super.html
Post up a pic and give us some info off the gun. I will do some looking for you. I have a blue book and a ton of Gun Digest books dating back to like 1948. Can probably find something. Also there are people who know this stuff on some of the gun sites I frequent.