I don't know about purchasing, but there are some maps here: http://www.tsl.state.tx.us/arc/maps/ Here's an interesting one: http://www.tsl.state.tx.us/arc/maps/images/map0435.jpg and here's a 1961 one. It must have been quite an event when they built the interstates - looks like a few neighborhoods got bulldozed: http://www.tsl.state.tx.us/cgi-bin/aris/ma...hp3?mapnum=5164