Thank you for your input Jeff, and also Brian Norden too. Highlighting the differences between a common lending library and a research library like the CRRM is very helpful. I've been to the DeGolyer in Dallas (research library) but I suppose I just hadn't given the subject enough thought.
And I hope my question wasn't taken in a negative way; I've visited a couple times, bought books & maps & etc both in person and online, and have always been very pleased.
I'm glad you guys (and gals) are there and appreciate everything that you do!