Ballantine Del Rey paperback, first printing, 1978. Includes introduction, "L. Sprague de Camp -- Engineer and Sorcerer" (essay) by Poul Anderson, and these works: 

 Hyperpelosity (1938);

 Language for Time Travelers (1938, essay); 

 The Command [Johnny Black] (1938); 

 The Merman (1938); Employment (1939); The Gnarly Man (1939); "Reward of Virtue" (1970, poem); Nothing in the Rules (1939); The Hardwood Pile (1940); The Reluctant Shaman (1947); The Inspector's Teeth [Viagens Interplanetarias] (1950); The Guided Man (1952); "The Ameba" (1973, poem); Judgment Day (1955); A Gun for Dinosaur [Reginald Rivers] (1956); The Emperor's Fan [Novaria] (1973; Two Yards of Dragon [Incorporated Knight] (1976); "The Little Green Men" (1976, poem); Author's Afterword (1978).

**

Ballantine Del Rey paperback, first printing, 1978. Includes introduction, “L. Sprague de Camp -- Engineer and Sorcerer” (essay) by Poul Anderson, and these Hyperpelosity (1938); Language for Time Travelers (1938, essay); The Command [Johnny Black] (1938); The Merman (1938); Employment (1939); The Gnarly Man (1939); "Reward of Virtue" (1970, poem); Nothing in the Rules (1939); The Hardwood Pile (1940); The Reluctant Shaman (1947); The Inspector's Teeth [Viagens Interplanetarias] (1950); The Guided Man (1952); "The Ameba" (1973, poem); Judgment Day (1955); A Gun for Dinosaur [Reginald Rivers] (1956); The Emperor's Fan [Novaria] (1973; Two Yards of Dragon [Incorporated Knight] (1976); "The Little Green Men" (1976, poem); Author's Afterword (1978).