Additionally, the TXDPS maintains a list of states with reciprocal agreements with TX. OK, AR, & LA are all on the list.
http://www.txdps.state.tx.us/adminis...eciprocity.htm
Make sure, however, that you read the text of the rules for the "Unilateral" states. In several cases, TX recognizes the other state's permits, but not vice versa.