Missing naturally are articles on Yugoslavia, the USSR, WWI, WWII, Vietnam, Mao, Rachmaninov, Stravinsky, lasers, TV, antibiotics, and Pakistan.
I have a lovely morocco-leather edition, with fresh as new onion-skin pages.
Absolutely irreplaceable. They're always available at good 2nd-hand bookstores(usually in library bindings), and no better intellectual investment is possible. ;^)