Public Recreation in Grand Rapids : digest of the cooperative work for public playgrounds by the Playgrounds Association, the Park and Cemetery Commissioners and the Board of Education of the City of Grand Rapids, Michigan. May 1912, Box: 10, Folder: 34. Robert G. Nelson Grand Rapids and Michigan history collection, Collection 363. Grand Rapids History Center. https://archive.grpl.org/repositories/4/archival_objects/181609 Accessed November 22, 2024.