Liebling's books The Sweet Science and A Neutral Corner are good subjective and first-person accounts of fights in the 30s-50s. The Sweet Science is particularly interested in the rise of Marciano. And has one of the best openings I've ever read:

It is through Jack O'Brien, the Arbiter Elegantarum Philadelhiae, that I trace my rapport with the historic past through the laying-on of hands. He hit me, for pedagogical example, and he had been hit by the great Bob Fitzsimmons, from whom he won the light-heavyweight title in 1906. Jack had a scar to show for it. Fitzsimmons had been hit by Corbett, Corbett by John L. Sullivan, he by Paddy Ryan, with the bare knuckles, and Ryan by Joe Goss, his predecessor, who as a young man felt the fist of the great Jem Mace.

I no longer have my copy of A Neutral Corner, I recall it is much more one-off reporting rather than tracing a career.

Bert Sugar edited The Great Fights, A Pictorial History of Boxing's Greatest Bouts, which begins with Sullivan/Kirain and ends with Saad Muhammad/Lopez, so that's just about 90 years of fights.

You can also still get Boxiana from certain places. Amazon used to have it on Print on Demand.