Thanks! Current market values for your books are as follows:
1) Set of 26 Robert Louis Stevenson, Schribner (1902) - these generally sell for $20 to $30 each, and set of 26 would be at the $500 to $750 level assuming good condition( see: http://www.zvab.com/servlet/BookDetailsPL?bi=11604022415)
2) The Austen books generally sell for $15 to $25 each, and a set of 12 would be at the $150 to $200 level (see also: http://www.abebooks.com/servlet/BookDetailsPL?bi=18747311809)
As far as appraisers, I recommend isa-appraisers.org and using its find an appraiser function. Also, there's the Antiquarian Booksellers Association, see also: http://www.abaa.org/
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