Book Sale: Rare Copy of A Maid from Mars, by Katherine Ross Derrick (1920s)

A book dealer at AbeBooks.com is selling a rare copy of A Maid from Mars (1920s), by Katherine Ross Derrick, for $5,000. This is the first time we have heard of this soft cover book and after searching a number of online resources (Internet Speculative Fiction Database, Google Book Search, Worldcat, Library of Congress, The British Library) we found only two other copies, both published in 1923. Here's a description of the copy for sale:

A Maid from Mars, by Katherine Ross Derrick (1920s)

Publisher: Printed by Oscar Blackford, Truro, Cornwall
Publication Date: 1920?
Binding: Soft cover
Edition: 1st Edition

Description: Derrick, Katherine Ross. A Maid from Mars. Truro, Cornwall: Printed by Oscar Blackford. N.d. c. 1921. First edition. 12mo., 48pp., sandy colored stiff wrappers with illustrated upper cover. Undated but references to wireless, aero-plane, flying machine & the war suggests about 1920. The story of a maid from mars who comes to earth [Cornwall] in human form, learns the language in a few months, attempts to share here Martian culture & spirit & who in the ends thinks mankind unready & splits. The earliest piece written about Mars by a woman & in a context which might be called loosely "feminist". Rare.

Price: $5,000

We note that a 22-page book titled The Maid from Mars, by Anna Steese Richardson, was published in 1901. Thuvia, Maid of Mars, by Edgar Rice Burroughs, was published first in the United States as a serial in 1916 and then as a book in 1920. It was published in London as a book in 1921.