The lack of a paved runway hints to me that it is not in the USA.
This response is not to argue or an attempt to correct you, but just information.
In the early days, about the date of this picture, there were quite a few airports in the US that did not have marked runways, at first. Also, just prior to World War Two, the US Navy built a lot of training fields that were huge grass fields*, with no marked runways. The theory behind the no marked runway was that the pilots were being trained to operate off aircraft carriers, as so they would always be landing in the wind.
The fallacy of this idea became apparent when it was realized that most like there would not be any aircraft carriers in the middle of places like Nebraska and sooner or later these new Navy pilots would have to land with a crosswind.
So don't let the lack of marked runway surprise you. However, most generally you are correct.
Cheers.
* There were some that were paved, such as the Norman, Oklahoma, KNOU airport. This airport is basically one square mile of concrete, made as a primary training base for the Navy in 1942. Today, of course, it has marked runways, but you can still see all that concrete.