A good question to ask a few days after New Year’s Eve!
This booklet was “prepared in the public interest for the medical profession”, initially by Strasenburgh Laboratories, with later editions credited to Pennwalt. Founded in Rochester in 1888, R.J. Strasenburgh Co. became the pharmaceuticals division of the Philadelphia-based Pennwalt Corp. in 1969. The first edition is from 1968. A “new expanded 15th edition” came out in 1982. Looks like the question will remain relevant forever.