Letter, Walter Heller to George Mitchell, Box 19, . John F. Kennedy Library. https://fraser.stlouisfed.org/archival/1197/item/3557, accessed on April 25, 2024.
Letter, Walter Heller to George Mitchell, Box 19, . John F. Kennedy Library. https://fraser.stlouisfed.org/archival/1197/item/3557, accessed on April 25, 2024.