Dear Ms. Biggins,
Thank you for posting your request on History Hub!
We searched the National Archives Catalog and located 22 file units relating to Christopher Hitchens in various collections at the William J. Clinton Presidential Library (LP-WJC). All of the file units have been digitized and are available using the Catalog. Please note that the documents included are not the written works of the late Mr. Hitchens, but you may find them of great interest to your research.
Many of his publications are available online through the Internet Archive: Christopher Hitchens, including his posthumous book, Mortality. You may also be interested in viewing his website for additional publications at Christopher Hitchens. As a prolific magazine journalist, you also may locate his past works online through The Atlantic or Vanity Fair.
His personal works do not appear to be available to the public at this time.
We hope this is helpful. Best of luck with your research!