Those are great! Thank you so much!
I was able to download a hi-res image from the Houston view book right away, and put in a request for a hi-res image of the second one (the photograph). I had only found one small photo of the house in a magazine article from 1990:
http://offcite.org/wp-content/uploads/sites/3/2010/03/FromMailHouseToYourHouse_Culbertson_Cite24.pdf