Some of the Yale dissertations in botany are available through Orbis paging (Request Recall or Delivery) from the Library Shelving Facility, the earliest two being Alexander William Evans' (later Eaton Professor of Botany at Yale University) "The Hawaiian Hepaticae of the Tribe Jubuloideae" (1898, reprinted from Transactions of the Connecticut Academy, vol. X, March 1900), and Wilton Everett Britton, "Vegetation of the North Haven Sand Plains" (1903, reprinted from the Bulletin of the Torrey Botanical Club, vol. 30:571-620, November 1903).
Dissertations from over 1,000 educational institutions in the U.S. can be identified (1861-) and read (1997-) by using ProQuest Dissertations & Theses Global. Citations with abstracts appear for 1980 onward. Some master's theses information is also accessible (citations and abstracts from 1988 to present). If not available in the Yale libraries or through the ProQuest Dissertations & Theses Global subscription, current affiliates may request a loan through Interlibrary Loan services. Requests for non-U.S. dissertations generally take considerably longer to fill although some can be lent through the U.S.'s Center for Research Libraries.