Which library holds the bulk of Edwin Hubble's correspondence, photos, notebooks and observing logs?

The Huntington Library holds the bulk of Edwin Hubble’s correspondence, photographs, notebooks, observing logbooks and related papers. The collection is in San Marino, California, where the library preserves major archives of American history and culture.

These materials offer a paper trail for Hubble’s life as an astronomer, including his work at Mount Wilson Observatory and his study of galaxies beyond the Milky Way. Correspondence and notebooks can reveal the practical side of research that is less visible in published papers: observing plans, calculations, collaborations and the gradual development of scientific ideas.

The collection came to the Huntington through Hubble’s wife, Grace Burke Hubble. She donated the papers after his death, and the materials were transferred following her death in 1980. The archive is easy to mix up with the Library of Congress or famous research libraries such as Oxford’s Bodleian, but those institutions are not identified as the main repository of Hubble’s surviving papers. The Huntington’s finding aid is the better guide for researchers seeking individual documents.