I am not in favor of short reviews, yet the names speak for themselves. It is not conceivable that you missed any of them unless you are new to this planet. That being said let me toss in some of the music before my opinion. Appalachian Spring - Rodeo - Billy the Kid - Fanfare for the Common Man.
Now here is the cliché. If you are starting out and only buy one Copland, this is it. There are many great recordings, yet you are not likely to find this combination of Composer and conductor and music again. My favorite on the set is Fanfare for the Common Man; however the others come close. You should obtain this album for your favorites also.