If you were intrigued by the horse sales records mentioned in a recent post, there are plenty more records in the U.S. National Archives that are unusual, unexpected, or unknown to most persons, that are just waiting for researchers to examine and make good use of.
I’ve outlined search strategies in an article entitled, “The National Archives Catalog” which I hope you’ll try for yourself. Hint: URLs in “green” colored text in the article are clickable links!