All the stories from the collections Nightmares and Geezenstacks and Space on My Hands plus an introduction by the author.

Many of the stories are very short, but good. Here is the last one in the book:

The End
Professor Jones had been working on time theory for many years.
"And I have found the key equation," he told his daughter one day. "Time is a field. This machine I have made can manipulate, even reverse, that field."
Pushing a button as he spoke, he said, "This should make time run backward run time make should this," said he, spoke he as button a pushing.
"Field that, reverse even, manipulate can made have I machine this. Field a is time." Day one daughter his told he, "Equation key the found have I and."
Years many for theory time on working been had Jones Professor.
End The
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Here's the full list:
Something Green (1951)
Crisis, 1999 (1949)
Pi in the Sky (1945)
Knock (1948)
All Good BEMs (1949)
Daymare (1943)
Nothing Sirius (1943)
Star Mouse (1942)
Come and Go Mad (1949)
Nasty (1959)
Abominable (1960)
Rebound (1960)
Nightmare in Gray (1961)
Nightmare in Green (1961)
Nightmare in White (1961)
Nightmare in Blue (1961)
Nightmare in Yellow (1961)
Nightmare in Red (1961)
Unfortunately (1958)
Granny's Birthday (1960)
Cat Burglar (1961)
The House (1960)
Second Chance (1961)
Great Lost Discoveries I - Invisibility (1961)
Great Lost Discoveries II - Invulnerability (1961)
Great Lost Discoveries III - Immortality (1961)
Dead Letter (1961)
Recessional (1961)
Hobbyist (1961)
The Ring of Hans Carvel (1961)
Vengeance Fleet (1950)
Rope Trick (1959)
Fatal Error (1961)
The Short Happy Lives of Eustace Weaver I (1961)
The Short Happy Lives of Eustace Weaver II (1961)
The Short Happy Lives of Eustace Weaver III (1961)
Expedition (1956)
Bright Beard (1961)
Jaycee (1955)
Contact (1960)
Horse Race (1961)
Death on the Mountain (1961)
Bear Possibility (1961)
Not Yet the End (1941)
Fish Story (1961)
Three Little Owls (A Fable)(1961)
Runaround (1942)
Murder in Ten Easy Lessons (1945)
Dark Interlude (1951) and Mack Reynolds
Entity Trap (1950)
The Little Lamb (1953)
Me and Flapjack and the Martians (1952) with Mack Reynolds
The Joke (1948)
Cartoonist (1951) with Mack Reynolds
The Geezenstacks (1943)
The End (1961)