5 Encyclopedia, Dictionary English eBooks
100 Inventions That Changed the World by Popular Science
Encyclopedia of Adolescence (2nd Edition) by Roger J.R. Levesque
Dave Dowling, "Wrong Word Dictionary: 2,500 Most Commonly Confused Words, 2nd edition"
The CIA World Factbook 2018-2019 by Central Intelligence Agency
Men and Manners: Essays, Advice and Considerations by David Coggins