When Ben Bova sold his original original science fiction anthology The Many Worlds of Science Fiction in 1969, he invited Robert Silverberg to contribute to it. Silverberg penned "Something Wild Is Loose" in the final weeks of 1969, just after completing his psychedelic SF novel Son of Man.
Black Cat Weekly #146
Art Taylor, Billie Livingston, Wil A. Emerson, Robert Silverberg, Hal Charles, Stephen Marlowe, Otis Adelbert Kline, E. Hoffmann Price, G.D.H. Cole, P.F. Costello
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An Enemy of Peace
Robert Silverberg
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Black Cat Weekly #142
Donna Andrews, Hal Charles, Andrew Welsh-Huggins, Pierre Souvestre, Allain Marcel, Mack Reynolds, Henry Slesar, Robert Silverberg, Frank Herbert, Thea von Harbou
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Black Cat Weekly #141
Veronica Leigh, Aeryn Rudel, Vinnie Hansen, Robert Silverberg, Randall Garrett, Lester del Rey, Frank Kane, Hal Charles, Seabury Quinn, Gore Vidal
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The Girl from Bodies, Inc.
Randalll Garrett, Robert Silverberg
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Black Cat Weekly #120
Janice Law, Eve Fisher, Joseph Walker S., Hal Charles, Robert Silverberg, Ron Goulart, Alan J. Wahnefried, Evelyn E. Smith, Sir Arthur Quiller-Couch
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Black Cat Weekly #113
Robert Silverberg, Norman Spinrad, Poul Anderson, M. E. Proctor, Avram Lavinsky, Skye Alexander, Hal Charles, Talmage Powell, Richard McKenna, Richard R. Smith
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Black Cat Weekly #105
Steve Liskow, Stephen D. Rogers, Adrian Cole, Hal Charles, Robert Silverberg, Joseph Payne Brennan, Frank Belknap Long, Lin Carter, John Gregory Betancourt, Henry T. Parry
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Black Cat Weekly #80
Phyllis Ann Karr, Hugh Lessig, Jim Thomsen, Robert Silverberg, Hal Charles, Robert F. Young, Murray Leinster, Nicholas Carter
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Other Covenants
Harry Turtledove, Robert Silverberg, Lavie Tidhar, Esther Alter, Gwynne Garfinkle, Elana Gomel, Rivqa Rafael, Jack Dann
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The Hot Beat
Robert Silverberg
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Gorgon Planet
Robert Silverberg
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