Early 1900s St. Louis Riverfront Photos

What did the St. Louis riverfront look like before the Arch was built? Here are some pictures that I scanned from glass slides, which I think are from the 1920s. These pictures include riverboats on the Mississippi, the St. Louis skyline and riverfront, and laborers taking breaks from working. I am not sure who shot these, but they appear to be candid and an interesting glimpse into the history of the St. Louis along the Mississippi!