William Hayes Ward, to whom many of the letters in the collection are addressed, became editor in the second decade of The Independent, and during the life span of the paper, was its most frequent contributor (Filler 301).
Filler, Louis. 1954. “Liberalism, Anti-Slavery, and the Founders of The Independent.” The New England Quarterly 27.3. (September, 1954): pp. 291-306.