The tabs below are arranged in a descending order by the size of the collection. Hathi Trust is first because it contains the greatest number of e-books.
Subject Coverage:
multi-disciplinary
Dates of Coverage:
http://www.hathitrust.org/visualizations_dates
Update Frequency:
unknown
Size:
more than 2.6 million public domain e-books
Subject Coverage:
a large variety of subjects
Dates of Coverage:
unknown
Update Frequency:
unknown
Size:
more than 2,400 books