You could refer her to the Antiquarian Booksellers Association Of America to find sellers of rare and antique maps. 
Louise

Sent from Louise's iPhone

On May 3, 2016, at 12:44 PM, Robert Lopresti <[log in to unmask]> wrote:

A patron has a 600 year old map with appraisal papers.  She wants to know where/ through whom to sell it.  I tried a web search but all the pages that came up were specific companies selling their services.  Is there a reliable page or organization to whom I can refer her?

 

Much thanks,

Rob

 

Rob Lopresti

Western Washington University

Librarian for Maps, Government Information, Huxley College of the Environment, and Canadian-American Studies.                                                           360-650-3342                 [log in to unmask]

"Hard would it be for one mortal to tell all the names of these [rivers], but everyone knows the river he happens to live by." - Hesiod, ca. 700 B.C.