The Mystery of the Missing 13th Floor
The practical evidence behind the missing floor: the concrete slab remains exactly where engineering put it, while buildings rename it 12A, 14A or something equally hopeful.
Cited in
Lacy, Robert. “The Mystery of the Missing 13th Floor.” WSRB Blog, 13 May 2022. https://www1.wsrb.com/blog/mystery-of-missing-13th-floor.