I have a 5x7" Press Graflex (SLR), which I understand was a very popular camera for news gathering around 1915 or so, and it was made until around 1920. There were plate and film holders for it, and I suspect it would have been an attractive format for contact printing purposes in a typical American broadsheet, which would have been 15" wide (so a 5x7" is half the page width, allowing for margins), plus the negs could easily be retouched. 5x7" rangefinder Graphics in the 1930s might have held out the same appeal for newspapers that were set up to work in this way.