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Algis Budrys
Algis & Alex Schomburg Budrys

See also:

If (J. F. Bone; D. M. Melton; Robert Mason; Algis Budrys; J. T. McIntosh; Robert Silverberg; C. C. MacApp; Lin Carter)
If (Larry Niven; Keith Laumer; Richard Wilson; C. C. MacApp; Algis Budrys; Bruce McAllister; Robert Ray; Mather H. Walke