Single photocopies may be made for research purposes. For quotations that are fair use as defined under U. S. Copyright Law , no permission to cite or publish is required. The Trustees of Princeton University hold copyright to all materials generated by Princeton University employees in the course of their work. If copyright is held by Princeton University, researchers will not need to obtain permission, complete any forms, or receive a letter to move forward with non-commerical use of materials from the Mudd Library. For materials where the copyright is not held by the University, researchers are responsible for determining who may hold the copyright and obtaining approval from them. If you have a question about who owns the copyright for an item, you may request clarification by contacting us through the Ask Us! form.