Contains various magazines, magazine articles, correspondence, photographs, brochures, sketches, calculations, cost estimates and manuscripts. The correspondence details various business projects, particularly, St. Mary's parish church in Spring Lake and Church of the Nazarene (Fuller Street). The data provides insights into cost, client expectations and Welch's architectural views. The photographs depict various shopping malls from the 1950s. An experienced urban planner, the collection also details Welch's views of Grand Rapids' urban renewal.