I’ll go first:
Calculus and Analytic Geometry (1951) by George Thomas
It’s readily available for < $10 and I find it’s style much more engaging than contemporary textbooks on the same topic.
And a bonus one - when we had questions for the doctor when my wife was pregnant, I read the beginning of this and can say with reasonably certainty that I reduced the probably of some negative outcomes as a result:
Callen's Ultrasonography in Obstetrics and Gynecology (Mary Norton, 2016)