Series IV, "Writings of John La Farge," contains manuscripts, typescripts, and printed copies of articles, lectures, verses, and critical comments. The material is arranged chronologically with undated items at the end of the series.
Series V contains articles, pamphlets and clippings on John La Farge and his work, In addition, there are several articles and clippings on other members of the La Farge family and on other subjects.