Laumer, Keith,
--The Propitiation of Brullamagoo, 1991. (novella)
--Reverse English, 1991. (short short)
--A Trip to the City, 1963. (novelette) (as It Could Be Anything, in Amazing Stories, January, 1963.)
--The Exterminator, 1964. (as A Bad Day for Vermin, in Galaxy, February, 1964.)
--Dinochrome, 1960. (as Combat Unit, in F & SF, November, 1960.)
--Hybrid, 1961. (F & SF, November, 1961.)
--Greylorn, 1959. (novella) (Amazing Stories, April, 1959.)
--Time Thieves, 1963. (novelette) (as The Star-Sent Knaves, in Worlds of Tomorrow, June, 1963.)
--Doorstep, 1961. (Galaxy, February, 1961.)
--Test to Destruction, 1967. (novelette) (Dangerous Visions, 1967.)