Efficiency
| First published | February 1943 |
|---|---|
| Type | Short Fiction |
| Length | Short Story |
| Series | Probability Zero |
| Date | Publication | Publisher | Type | Page | |
|---|---|---|---|---|---|
| February 1943 |
|
Astounding Science-Fiction, February 1943 | Street & Smith Publications, Inc. | MAGAZINE | 89 |
| August 2013 |
|
Blind Man's Buff and Other Stories | Thunderchild Publishing | Collection |