For the past 40 years, I've been haphazzardly collecting music of the "Regular Army-O." The only recording that I'm aware of that is dedicated to the subject is the one which you mentioned. If you are interested in written souces you may wish to look at E.A. Dolph's "Sound Off" or Don Rickey's "Forty Miles a Day."
If you are interested in really mining the area, I can refere you to several dozens of books that have bits and pieces of material.
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