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. For those few instances beyond fair use, any copyright vested in the donor has passed to Princeton University and researchers are free to move forward with use of materials without anything further from Mudd Library. For materials not created by the donor, where the copyright is not held by the University, researchers are responsible for determining who may hold the copyright and obtaining approval from them. In these instances, researchers do not need anything further from the Mudd Library to move forward with their use.