Hewlett-Packard HP 67 electronic calculator, 1976

Hewlett-Packard HP 67 electronic calculator, 1976, WBC Box 5 Item 79, Box: 5. William Bradley Calculator Collection, WBC. National Center for Atmospheric Research (NCAR) Archives. https://aspace.archives.ucar.edu/repositories/2/archival_objects/9473 Accessed June 15, 2026.