Scholarship on the Collection
A list of some of the important work on the Yale Japanese collections can be found here
From 2010 to 2015, a team of scholars from the Historiographical Institute at Tokyo University, led by Professor Kondō Shigekazu, conducted a comprehensive study of the Yale University Library’s extensive collections of pre-20th century Japanese materials. The full report of their findings, including annotated catalogs and explanations of individual items, can be found here.
Professor Tom Conlan of Princeton University provides a comprehensive explanation of the contents of the Heishi Monjo, an important set of medieval documents in the Yale collection, on his website here.