The Captain America books reprint all the CAS stories fro Captain America Comics #1-10 without the backup stories.
The two Golden Age volumes are miscellanies from right through the Golden Age era with a few Atlas era stories tossed in.
Most of this material has beeen reprinted in much better quality in the Marvel Masterworks by now.
Notable exceptions are the Red Raven story from Red Raven comics #1 and Citizen V and the Fin stories from Comedy Comics #9
in volume 2.