Mayer Family Library, Collection ID-3444, Box: Mayer 1; Box: Mayer 2. Concordia Historical Institute.
Mayer Family Library, Collection ID-3444, Box: Mayer 1; Box: Mayer 2. Concordia Historical Institute. https://concordiahistoricalinstitute.libraryhost.com/repositories/2/resources/3888 Accessed April 25, 2025.
