A Short Work on the Geography of Mexico and Central America from 2234 B. C. to 421 A. D. Hills, Louis Edward. A Short Work on the Geography of Mexico and Central America from 2234 B. C. to 421 A. D.. Independence, MO: N.p., 1917.
New Light on American Archaeology Hills, Louis Edward. New Light on American Archaeology. Independence, MO: Lambert Moon Printing Company, 1924.
New Light on American Archaeology (Second Edition) Hills, Louis Edward. New Light on American Archaeology (Second Edition). 2nd ed. Independence, MO: Lambert Moon Printing Company, Not Available.
