Second, Fields edited important collections of letters and biographical sketches. Her subjects included her husband, James T. Fields, John Greenleaf Whittier, Celia Thaxter, and Harriet Beecher Stowe, as well as the Jewett letter collection. While these are not critical, scholarly works (the Jewett collection, especially, is heavily edited), they do provide primary material for the researcher. Her book "Authors and Friends" (1896) is a series of sketches, the best of which are of Harriet Beecher Stowe and Celia Thaxter. Fields's diaries remain unpublished, except for excerpts published by M. A. DeWolfe Howe in 1922.