Google a search on Elizabeth George Speare and you will get a nice bio and a list of New bery Award winners and honor books that she wrote between 1957 and 1984. Her novels for young adult readers were the stuff of history that I grew up on - Calico Captive, The Bronze Bow, The Sign of the Beaver, and The Witch of Blackbird Pond were all classics of historical fiction. Yet, nowhere in that biography will you find note of her novel for adults called The Prospering.
The Prospering is a fictionalized (albeit incredibly well-researched) novel that revolves around the grand experiment undertaken by the Massachusetts settlers to convert the native peoples.

