Correspondence with Adams, vice president of the Utah State National Bank in Salt Lake City, and president of the American Bankers Association. Adams worked with Eccles in one of Eccles' banks for ten years. Though the two had very different economic philosophies, they were longtime friends.

Letters and speeches of Orval Adams, Lewis H. Brown, Stuart Chase, J. I. Craig, James H. R. Cromwell, Cyrus S. Eaton, William Trufant Foster, Rudolph Hecht, B. E. Hutchinson, R. C. Leffingwell, Walter Lippmann, Thomas I. Parkinson, J. David Stern, and Robert P. Vanderpoel. These materials discuss economic ideas. The catalysts for many of the letters are often books, articles, or speeches.

Correspondence and a speech by Brown, chairman of the board of Johns-Manville Corporation and a member of the board of directors New York Federal Reserve Bank.

Correspondence with Chase, a writer for the Twentieth Century Fund and author of many articles on economics. Chase frequently sent advance copies of his publications to Eccles for criticism.

Correspondence concerning international monetary affairs. Craig, commissioner for customs at the Ministry of Finance in Cairo, Egypt, first met Eccles at the Bretton Woods Conference.

Correspondence concerning money and taxation. Cromwell was appointed minister to Canada in January 1940, then resigned in April to enter the election for a U.S. Senate seat for New Jersey, which he lost.

Letters and speeches of Orval Adams, Lewis H. Brown, Stuart Chase, J. I. Craig, James H. R. Cromwell, Cyrus S. Eaton, William Trufant Foster, Rudolph Hecht, B. E. Hutchinson, R. C. Leffingwell, Walter Lippmann, Thomas I. Parkinson, J. David Stern, and Robert P. Vanderpoel. These materials discuss economic ideas. The catalysts for many of the letters are often books, articles, or speeches.

Correspondence with Eaton, a mid-western industrialist, concerning financing by New York interests.

Letters and addresses by Foster, director of the Pollak Foundation for Economic Research. Foster knew Eccles before Eccles went to Washington.

Correspondence concerning controversies over the Banking Bill of 1935, and a presidential report of the Bankers Association implying that Eccles was in favor of absolute governmental control of banking.

Friendly and often sarcastic correspondence with Hutchinson, chairman of the Chrysler Corporation's finance committee, regarding current issues of the National Manufacturers Association platform, high wages, and union power.

Correspondence and speeches by Leffingwell, chairman of the board of the J.P. Morgan Company, regarding the Federal Reserve Board's role in the 1937-1938 recession, a sensitive subject to Eccles.

Correspondence with Lippmann, columnist for the New York Herald Tribune, focusing on the Banking Bill of 1935. Lippmann and Eccles respected one another's economic views.

Correspondence between Parkinson, president of the Equitable Life Assurance Society in New York, and Allan Sproul, president of the New York Federal Reserve Bank, and between Eccles and Harold G. Brown, vice president of Shenandoah National Bank in Virginia. Parkinson was critical of Federal Reserve policy, and Brown was critical of Parkinson's public pronouncements.

Correspondence with Stern, publisher of the New York Post and the Philadelphia Record, and class C director of the Philadelphia Federal Reserve Bank. Stern supported the New Deal but had an uneasy relationship with Eccles. He resigned his directorship in December 1936 to concentrate on publishing.

Correspondence with Vanderpoel, financial editor of the , the , and a strong supporter of the New Deal. He and Eccles were close friends.