For another study of the origin of the "72-year rule", I researched the topic and published a paper on it in summer of 2008 that we reproduced on the One-Step (stevemorse.org) website. See: https://stevemorse.org/census/rule72.html In addition, part of that information I put in my YouTube video, "US Census: Questions, Confidentiality, and the 72-Year Rule" which can be seen at: https://youtu.be/-3x0BpkXkJY Joel Weintraub, Dana Point, CA
