Letter to Marriner Eccles
The Marriner S. Eccles Document Collection
Includes mentioned attachment: preface to Paul's next Studies. Handwritten note in bottom left corner of first page.
Paul, Randolph E., 1940, Letter to Marriner Eccles, from The Marriner S. Eccles Document Collection, accessed Dec 7, 2013 from FRASER, http://fraser.stlouisfed.org/docs/historical/eccles/025_02_0003.pdf