Your job is to identify and survey the materials rather than to sort and discard. Libraries have intrinsic value, but they also can tell about the interests of and influences on their owner. If your papers are donated to a library archive, then you may wish to donate your books to the same library. It would be helpful to catalog your books for future researchers before they are transferred. Theses represent who has been trained and which students may have been influenced by the ideas of a teacher.
Acknowledgments are of particular interest.
Manuscripts by Other Authors. Manuscripts provide information about close contacts among colleagues and the knowledge base of the owner. They also provide insights into access that individuals had to unpublished information. Your Own Manuscripts. Successive drafts of one's own manuscripts provide information on the developments of ideas and the creative process itself.