SFFaudio has a new haul of public domain PDFs, or at least public domain in the USA or Canada.

“after an extensive search of copyright records, all [these are] public domain”

These are presumably now available for audio reading, and YouTube’s bots won’t freak out at the upload. Here are some recent ones in PDF, which are deemed public domain…

The Other Tiger by Arthur C. Clarke.
On Mind And Matter by Arthur C. Clarke.
The Fence by Clifford D. Simak.

If You Don’t Watch Out by Frank Belknap Long.
The Lichen Of Eros by Frank Belknap Long.
The Plague From Tomorrow by Frank Belknap Long.
The Timeless Man by Frank Belknap Long.
Black Demons Dance by Frank Belknap Long.

The Treasures Of Tartary by Robert E. Howard. [Kirby O’Donnell]

Spawn Of The Green Abyss by C. Hall Thompson.

Goblin Feet by J.R.R. Tolkien. [1915 fantasy poem published when an undergraduate at Oxford, a lively example of the Edwardian fairy tradition of the time]  [PDF scan has already been deleted but Tolkien Gateway has it transcribed.]

The Power Of Wine by H.P. Lovecraft. [1916 poem, must be out-of-copyright already, but nice to have as a PDF scan from Tryout.]