Here's a recent article in Rare Book Hub about Kurt Zimmerman, a prolific and talented Houston book blogger and some of his recollections of Dorothy Sloan.

Sloan who recently passed away, was one of the all time great Texas rare book dealers and also a talented auctioneer. A woman in what was mainly a man's field, she was widely admired (often imitated) and seldom equaled. Here's the link to the story https://www.rarebookhub.com/articles/3290