Search the HathiTrust Database of eBooks
Includes titles from Google's book digitization program. Books that are available to all are listed as "Full View". If you search for a topic or book, you have the option of refining your search with "Full-Text" on the results bar on the left of the page. There are a number of eBooks available in this way. (If you find any gems, let the rest of us know!)
For example:
Children's Shakespeare
Voyages of Dr Doolittle
The tailor of Gloucester, by Beatrix Potter
Japanese fairy tales, by Lafcadio Hearn and others.
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