The Mark Twain Papers and the Mark Twain Project at The Bancroft
Library now have a home page with thorough descriptions of
holdings, finding aids, copying procedures, permissions
requirements, and a complete list of publications.  It is at:

http://library.berkeley.edu/BANC/MTP/

A year or two ago, Paul Machlis asked us if we would use the Union
Catalogs of Clemens letters if they were put online.  According to
this new description, "An on-line version of both catalogs, regularly
updated by editors in the Project, will be available shortly."

Jim Zwick
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http://www.rochester.ican.net/~fjzwick/