Try the Clara Barton National Monument in Glen Echo (outside of Bethesda)
Maryland.  I believe it is run by the National Park Service.  It's been a
couple of years since I've been there but I seem to remember that they had
an archive of her personal documents.

Dr. Elizabeth A. Moore, Curator
Virginia Museum of Natural History
1001 Douglas Avenue
Martinsville, VA  24112
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----------
> From: Barbara Ware <[log in to unmask]>
> To: [log in to unmask]
> Subject: Clara Barton/Span Am
> Date: Tuesday, March 24, 1998 6:47 PM
>
> We are preparing for our Spanish American War exhibit.  Clara Barton was
> in Tampa during the preparations for embarkation to Cuba.  We understand
> she wrote some diaries. Does anyone know of these diaries and where we
> might find out about them.  Please reply offlist.
> --
> Barbara E. Ware
> Librarian/Archivist
> Tampa Bay History Center
> P.O. BOX 948
> Tampa, FL 33601-0948
> email: [log in to unmask]
> homepage: http://home1.gte.net/thistory