Hello,

        When I have been asked to appraise materials, I have referred the
people to various antique map vendors on the list on the WAML Map
Librarian's Toolbox.  Usually, they can find something similar (a Rand
McNally map a year older or younger, a map for a neighboring state or such)
that will give them an approximation.  Everyone has been pleased with that
solution.

Linda Zellmer

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Linda Zellmer
Maps Librarian
Arizona State University Libraries
P.O. Box 871006
Tempe, AZ 85287-1006
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Phone: (480)-965-5973
Fax: (480)-965-0883