This series contains Goodrich's general correspondence related to his studies of Thomas Eakins. The bulk of the material is correspondence with other scholars of Eakins, including Maria Chamberlin-Hellman, Gordon Hendricks, William Innis Homer, Elizabeth Johns, Margaret McHenry, and Elizabeth Milroy. Files with these individuals document the exchange of ideas and information regarding Eakins and his work, as well as the part Goodrich played in the production of publications and exhibitions by these individuals. The series also includes a significant amount of correspondence with graduate students working on Eakins, who wrote to Goodrich to request information and/or access to his research files.

Other files document Goodrich's relationship with institutions with significant holdings of Eakins's work, namely the Philadelphia Museum of Art, the Pennsylvania Academy of Fine Arts, and the Hirshhorn Museum and Sculpture Garden. Representatives from these institutions, particularly Phyllis Rosenzweig from the Hirshhorn, correspondended frequently with Goodrich about questions of attribution and provenance. Henri Marceau from the Philadelphia Museum of Art published a checklist of works by Eakins in 1930, and corresponded frequently with Goodrich in the early 1930s.