The first (1935) adaptation of Hammett’s story, featuring George Raft
The second (1942) version of the film, which is my personal favorite of the two.
Here we have Ladd discovering the source of the mysterious notes. Does anyone know what kind of typewriter this is? From the chrome tops of the feet, I almost want to say it’s an Olympia, but I’m just guessing.
You can see Ladd’s reflection in the mirror as he spies on Lake.
Caught in the act of typing another anonymous note.
The Everyman’s Library series by Random House has two volumes collecting Hammett’s
work. You can get the volume featuring “The Glass Key” HERE. 
The original Black Mask magazine in which Hammett’s story first appeared.
Some book editions of the story.
Streamlines DeLuxe 