Ernest Hemingway writing. This is a stereotypical moment for a writer: to be caught in the act of actual writing. This being the point, it is likely that he is not actually writing
Farewell to Arms or
The Snows of Kilimanjaro in any of these pictures but simple correspondence. Or a check to PG&E, or the equivalent of that.
In this photo Hemingway is already old and he is writing out in the open. He has a little desk and chair so I would guess this was not on a hunting trip.
Immersed at work in his study.
At work again, only in a tent.
This photo shows Hemingway typing, with a book opened by his side.