Windows Into Tomorrow - a reprint-anthology edited by Robert Silverberg (1974.) Stories date from 1951 to 1971 - original appearances in Galaxy (3), New Worlds, Magazine of F&SF, Analog (2), Star SF, Universe.

(Introduction by Robert Silverberg)
"Year of the Jackpot" by Robert A. Heinlein
"Billenium" by J. G. Ballard
"A Pail of Air" by Fritz Leiber
"The Electric Ant" by Philip K. Dick
"The Last of the Romany" by Norman Spinrad
"Battlefield" by Harlan Ellison
"All the Last Wars at Once" by Geo. Alec Effinger
"The Pain Peddlers" by Robert Silverberg
"Dodkin's Job" by Jack Vance