Books by Stephen Barr
Upside down Hat
Upside down Hat
Believing Scientist
Believing Scientist
Puzzlequiz
Second Miscellany of Puzzles Mathematical and Other Wise
The Magazine of Fantasy and Science Fiction, December 1968 (Volume 35, No. 6)
A Miscellany of Puzzles
Experiments in topology
Galaxy Science Fiction, Vol. 16, No. 3 (July, 1958)
Experiments in Topology (Dover
Experiments in Topology (Dover Books on Mathematics) by Stephen Barr (1989-03-01)