The Yale Library offers complimentary access to two popular reference management programs, RefWorks and EndNote. EndNote is available in two versions: a web version and as a downloadable program via the Yale Software Library. (Zotero, another popular citation manager, is available for free as a download; see the Zotero website.)
The Yale Library's Digital Collections database contains over half a million images from many different Yale collections, including the Beinecke Rare Book and Manuscript Library, Manuscripts & Archives, the Lewis Walpole Library and others. Viewing of many of these images from off-campus requires a VPN connection.
The Samuelson Law, Technology & Public Policy Clinic at the University of California, Berkeley School of Law has created a useful handbook, Is It In The Public Domain?, for determining whether material published in the United States between 1923 and 1977 is out of copyright.
Yale's Office of the General Counsel has a useful Copyright: Introduction page designed specifically for Yale faculty. The OGC also has a website describing the University's Copyright Policy as well as information on Academic Copying and Student Course Packets.
For other issues concerning copyright and fair use, please consult with your Subject Specialist or Library Liaison.