From a HT Announcement:
On December 5th HathiTrust’s collections grew to 16 million volumes! Book number 16,000,000 was digitized and deposited by the University of Illinois at Urbana-Champaign. Osborne’s London and Birmingham Railway guide. Illustrated, published in 1840 at the height of “railway fever” in Great Britain, was written as something of a guidebook to inevitable progress.
HathiTrust announced volume number 15,000,000 in February 2017.
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On a Related Note…University of Illinois (UIUC) Library Adds 14 Millionth Volume to Collection (December 11, 2017)