United States. Federal Open Market Committee. "Meeting, April 12, 1960 : Memo: Draft of Proposed Letter to 21 Senators," Federal Open Market Committee Meeting Minutes, Transcripts, and Other Documents (April 12, 1960). https://fraser.stlouisfed.org/title/677/item/22823/content/pdf/FOMC19600408memo01, accessed on October 21, 2020.
This collection of meeting documents contains a memo released by FOIA request.
Board of Governors of the Federal Reserve System