From the wikipedia article on Stephen R. Donaldson and his "The Chronicles of Thomas Covenant the Unbeliever":
The Chronicles were originally published as two trilogies of novels between 1977 and 1983. According to his current publisher, Putnam's, those two series sold more than 10 million copies. A third series, The Last Chronicles of Thomas Covenant, began publication in 2004 with the novel The Runes of the Earth. With the second book of that series, Fatal Revenant, Donaldson again attained bestseller status when the book reached number 12 on the New York Times Bestseller List in October 2007. (https://en.wikipedia.org/?title=Stephen_R._Donaldson)
I was curious to try and find out where Stephen R. Donaldson placed among authors of the genre in terms of total books sold. I'm not even sure what ten million copies means. Since it was two trilogies is that ten million copies of all six books? Is it ten million books sold divided by six possible books? Etc.
In addition he had a third series in the Thomas Covenant lineup which included four books, one of them "Fatal Revenant" is the second of that series, and is listed in the article as a best seller.
He also had several other series as well as books of short stories.
I'm trying to figure out his place in history since he was my favorite author growing up. I loved him even more than Piers Anthony, Tolkien, Zelazny, Eddings, and the others that were popular at the time.
I've been searching for awhile to find out how what the total sales of his books are and can't find it anywhere. I remember reading once that at the time his books were only second to Tolkien's in terms of total sales.
I'm sure Harry Potter is one, Tolkien is second, but I'm not sure how it goes or is broken down from there.
Does anybody know of a site that lists science fiction and fantasy books and/or series by total number of book sold? It doesn't have to be a site, any other reference material is fine, or if you just want to post the results here then if you can give me maybe the top five and then the author I am asking about Stephen R. Donaldson.