The material in this subseries divides into two general groups. The first documents individual catalog entries. Most of the material is Goodrich's correspondence with the private collectors, public institutions, galleries and auction houses holding works by Eakins, or those individuals who could help Goodrich locate the current owner. Because of Eakins' portraits of various church leaders, there is significant correspondence with several religious organizations, particularly Saint Charles Borromeo Seminary (Overbrook), as well as the American Catholic Historical Society and the Academy of Mercy. In regard to the Seminary's portrait of Archbishop Wood (G107), there are also three technical reports prepared by the Philadelphia Museum of Art conservator Theodor Siegl during the early 1970s. Notes, clippings, ephemera and photographs are also included, along with photocopies of all document types. Like the "Master Catalog" files, these include some of Goodrich's papers originating from his 1933 study, such as the questionnaires he sent to the owners. There are also similar forms the Pennsylvania Museum of Art sent out apparently in preparation of the comprehensive list published in the 1930 Bulletin. Other notes, dating between 1972 and 1978, probably originated with his 1982 book since the headings reference various "Chapters." While some of the papers in this subseries duplicate those in the master files, a significant number are the originals that Goodrich would only reference on the master catalog entry form. Most of the papers on which Goodrich noted several entry numbers are now in folders entitled "Multiple" and arranged alphabetically by correspondent or relevant subject. The folders at the end of this group contain most of the correspondence and notes Goodrich kept in his "Agenda" folders. Because the information contained is not noted in the "Master Catalog" files, the papers are identified here as "Unrecorded research," with relevant catalog entry numbers noted in the folder title.
The folders comprising the second group pertain to bibliographic references. Documentation ranges from detailed to summary--from photocopied portions of books to lists of bibliographic citations. The catalogues published by Alan Burroughs (1924) and by the Philadelphia Museum of Art (1930 bulletin, published as Pennsylvania Museum of Art), both of which are photocopied here, were sources Goodrich referred to from his earliest studies. He cited both in his format and methodology notes of 1930. Also included are portions of Gordon Hendrick's 1974 book, which became a later source Goodrich frequently turned to. Additional books, articles, museum bulletins and exhibition catalogs written by scholars other than Goodrich are included in the "Reference" series. Goodrich marked-up many of them, usually with his related catalog entry number. The "Other writings" series consists of similar studies written by Goodrich.