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Library of Congress, the largest library in the world offers free research assistance by experts. I finally had an excuse to use their service and was blown away by how helpful they were. I had been reading History of the Conquest of Mexico written in 1890, and could not find any information for one of the cited sources which was written 300 years prior, so I submitted a request and — in less than 24 hours — I received a response from the Hispanic Division Reference Librarian who linked me to a digitized copy of the manuscript, and 5 other links to codices of Pre-Hispanic History that I would have never discovered otherwise. It’s such an invaluable resource. — CD