Stephen Barr

Experiments in topology

2012

Upside down Hat

2022

Puzzlequiz

1990

A Miscellany of Puzzles

1995

Believing Scientist

2016

The Magazine of Fantasy and Science Fiction, December 1968 (Volume 35, No. 6)

1968

Science Fiction Gems

2016

New Jersey

1998

Galaxy Science Fiction, Vol. 16, No. 3 (July, 1958)

1958

2nd Miscellany of Puzzles

1982