Merle Greene Palenque Mayan Lord Litho (vs, son)

[Kele]

Would anyone know how to go about finding out the value of a Merle Greene Robertson lithograph of a Palenque stone?

Searching the internet brings me nothing but information regarding her life (a fascinating woman) or information regarding her books, but nothing about the numbered lithographs she made from her Mayan rubbings.

I have one that is numbered and signed by the artist, titled "Mayan Lord, Palenque," seen here:

http://www.mesoweb.com/rub/view.asp?...sAND=&sANDNOT=

My thanks in advance for any information.

[La Ceiba]

I would also be interested in the value of this piece. I have #65 of 200 and would like to know the insurance value