I frequently visit the website Shorpy.com, which features high resolution photographs from the 1850s to 1950s. Their tag-line is true, there always is something interesting there.
I was pleasantly surprised to find these two images; the first is of the Underwood Typewriter Co.’s office in Washington, D.C. around 1919. Second photograph is the “Office Girls” from 1925. The girl on the left is hard at work on her Underwood. Click on the images to visit the site and you can find super-mega-high resolution scans with incredible detail.