The Robert Sattelmeyer article is "Did Sam Clemens Take the
Abolitionists for a Ride?" in NEW ENGLAND QUARTERLY (June 1995), p.
294-99.  For independent researchers without academic access, this
article is free to view online via

http://www.jstor.org

JSTOR allows free registration and many articles, including this one,
are available for viewing at no charge.

Barb