ArchiveGrid

Also worth searching is ArchiveGrid.
http://beta.worldcat.org/archivegrid/

Try searching Kip (or Kipp).
There is a list of about 555 manuscript items to look at.
Of immediate interest to me was the Francis Everington Kip papers at St. Lawrence University, Canton, NY.
I had a look at the collection the 2nd week of May.

Regards
Edward Kipp