I've got all the early 1970s Guns & Ammo Annuals. Memorized that handgun velocity page when I was a teenager.

I've actually obtained some of those velocities over a chronongraph using guns with similar length barrels and factory loads. It wasn't long after those G&A Annual charts were published that the "4-inch vented test barrel" quotations became de rigueur and those quoted velocities were known for being artificially low.