It's used in lots of academic books, but it's the standard font for the Oxford History of the United States.

Some version of Dwiggins's Electra.

Thank you.

Sorry, DavidH1947, but the capital R in Electra does not have the rounded top seen in the sample.

James B., your sample is too small and too low-res to be of much help in an ID. Can you at least tell us which edition and volume of the Oxford History of the United States your sample comes from (published date), or can you provide a much larger, sharper image?

IMG_1150.heicHow's this?

Looks like it's Parkinson Electra.

Your second sample is Electra.

Sorry David H1947, but the first sample’s resolution wasn’t giving Electra to me. You obviously saw something I didn’t.