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For media / rights inquiries regarding QUACKERY: A Brief History of the Worst Ways to Cure Everything, please contact Eric Myers at Dystel & Goderich.
Note: I receive many questions about the Encyclopedia Britannica because of the article I wrote for The Guardian in 2010. Please note that I can not offer specific valuation advice on your copy of the 11th edition of the Encyclopedia Britannica. You can search abebooks.com or ebay.com to get a general sense of retail value, or contact a rare book dealer listed with abaa.org (America) or aba.org (UK) to receive an appraisal of your particular copy.