sentences:  In the 1930s, she retired to Aberdeen, Washington, but continued her scholarship by receiving foundation and library study awards.She wrote four books in the 1930s, but turned her attention to publishing valuable accounts of western travel, the fur trade, and Indian policy that she had unearthed in her research.She edited the letters, diaries, and account books of Francis A. Chardon, a fur trader who had traveled and lived among American Indians on the Upper Missouri from 1834 to 1839.