Surprisingly, numerous  of Fritz’s stories are still uncollected, and can only be found in anthologies and magazines.

I will be annotating this list with descriptions as I own the majority.

Another Cask of WineInfinity Four (1972)
Be of Good CheerGalaxy Oct 64, 10th Annual Edition: The Year’s Best S-F (1965-7), Rulers of Men 1965
Crimes Against PassionGamma 1(1963)
Gold, Black, and SilverQuark/2 (1971)
Psychosis from SpaceSatellite Science Fiction, April 1959
Rats of LimboFantastic (Aug 1960)
Sunk Without TraceWorlds of Tomorrow (jan 1966)
The Moon PortholeElsewhere Vol II (1982)
The Princess in the Tower 250,000 Miles HighNew Dimensions Science Fiction Number 7
The Silence GameThe Magazine of Fantasy and Science Fiction, April 1954
The Square Root of BrainBest SF Stories from New Worlds 4
Slack Lankhmar Afternoon Featuring HisvetTerrys Universe
Stonehenge 94101Berkeley Barb 1976
The Turned off HeadsThe Magazine of Fantasy and Science Fiction, January 1968
They Never Come BackFuture Fiction 1941
Time in the RoundGalaxy Science Fiction, May 1957, The Third Galaxy Reader
When the Openly WalkGalaxy Magazine, August 1969
X Marks the PedwalkGalaxy Magazine, August 1969, An ABC of Science Fiction,Nightmare Age,Car Sinister