Mathias Alten, the Man / written by Gloria Alten Gregroy, grandaughter of Artist ; arranged by Henry Matthews, Directory of Collections and Galleries, Grand Valley State University. Presentation to the Grand Rapids Torch Club, Feb. 13, 2001. 2002.068, Box: 1. Ralph W. Demmon art and architecture collection, Collection 365. Grand Rapids History Center. https://archive.grpl.org/repositories/4/archival_objects/176096 Accessed November 23, 2024.