Hello and welcome! My name is Doris.I have been an antiques collector, dealer and appraiser for over 56 years.I will be pleased to help you.
Your set of 9 Anne Fellows Johnston's "Little Colonel " series would have an estimated retail value of $340 - 360 assuming good condition and depending on sale geographic location.
This site explains how to sell old books online where you can sell either retail or quickly by auction.
How to sell old books:http://www.internetbookselling.com/sell-old-books.html
In general, a private seller to a dealer, via consignment or at auction can expect 30-60% of estimated retail value.
Insurance replacement values are usually about 10% more than retail values.
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