Gilbert, Douglas R., “Civil Defense Tower, Holland, MI,” Digital Collections, accessed December 13, 2025, https://digitalcollections.library.gvsu.edu/document/53213.
Black and white photograph of a Civil Defense Tower located in Holland, Michigan, among snow-covered dunes along the channel leading to Lake Michigan. The Holland Harbor Lighthouse, known as "Big Red," can be seen in the background. Scanned from the negative.