The Correspondence series is composed of both professional and personal correspondence between Kemmerer and colleagues, government officials, institutions, businesses, and friends and family. The majority of the correspondence is related to his scholarship, his involvement in various organizations, and his financial advisory work. Please see the subseries descriptions in the contents list for additional information about individual subseries.

The Country Files series documents Kemmerer's financial advisory work and also contains materials collected by Kemmerer as he conducted research on particular countries. The series contains material from twenty-six countries, mostly in Latin America. The best documented are China, Colombia, and Peru, and to a lesser extent Chile, Ecuador, the Philippines, and Poland. The papers include correspondence, reports, clippings, and government publications regarding a wide variety of subjects, including banks and banking systems, currency and monetary policy, government budgets and debt, taxes, trade laws, and information regarding the economic and social conditions of the countries. The papers also include correspondence, reports, clippings, and other materials of the commissions of financial advisors lead by Kemmerer.