1. The unpublished papers, letters, lectures, and notebooks Literature below are stored at the Harvard Depository and can be accessed at Houghton Library. A catalogue of Quine’s unpublished work can be found at
http://oasis.lib.harvard.edu/oasis/deliver/~hou01800
. The references are ordered by item number.
2. Quine, W. V. & American Philosophical Association (1936–1986). Correspondence. Box 001, Item 31.
3. Quine, W. V. & Center for Advanced Study in the Behavioral Sciences (1955–1979). Correspondence. Box 007, Item 205.
4. Quine, W. V. & Clark, J. T. (1951–1953). Correspondence. Box 008, Item 231.
5. Quine, W. V. & Conant, J. B. (1951–1979). Correspondence. Box 009, Item 254.