chosen volumes to the library. Hollis continued to send books regularly until his death in 1774, and he bequeathed £500 for the university to continue acquiring books. This became Harvard's first endowed book fund, and the fund has grown annually since. Harvard Library's online catalog, HOLLIS, a bacronym for "Harvard On-Line Library Information System", is named after him. In 1841, with space limited in Harvard Hall, the library was moved to Gore Hall in 1841. In 1912, the library moved again after Gore Hall became unsuitable, and the library was moved into multiple buildings with some of the buildings representing specialized topics. Some books were digitized in Google Books under the management of former Harvard Library director Sidney Verba. In August 2012, based in part on recommendations from the Task Force on University Libraries and the Library Implementation Working Group, Harvard Library began working to coordinate and encourage collaboration among Harvard's 73 libraries. Holdings Harvard Library houses a range of historical artifacts and primary documents from around the world, including one of only 23 complete Gutenberg Bibles. The largest collection of East Asian-language material outside of East Asia is held in the Harvard–Yenching Library. The largest collection of archives focused on business and economic history is housed in Baker Library/Bloomberg Center at Harvard Business School. Botany Libraries’ archives include Henry David Thoreau’s personal herbaria, letters from Charles Darwin to Asa Gray, and thousands of botanical illustrations. The Wolbach Library holds the oldest surviving images of the moon, and the Tozzer Library is one of the oldest anthropological libraries in the world. Harvard Library also has a robust collection of digital content. More than 6 million digital objects are accessible online by anyone, regardless of whether or not they're affiliated with Harvard, via the Harvard Digital Collections page. The CURIOSity tool offers another way to explore Harvard's digital collections, providing curated views, specialized search options and discovery of unique content. Curated collections include the Colonial North America archive, the Islamic Heritage Project, and over 3,5000 digitized daguerreotypes. Publications By 1973, Harvard Library had authored or published over 430 volumes in print in addition to nine periodicals and seven annual publications. Among these is a monthly newsletter, The Harvard Librarian and a quarterly journal, Harvard Library Bulletin, which was established in 1947, dormant from 1960 until 1967, and published regularly since. The Bulletin is published three times a year in spring, summer,