Riverside Bouquinistes of Paris
Jasmin read about the book vendors that have stalls along the Seine. You can read here: https://www.ricksteves.com/watch-read-listen/read/articles/paris-riverside-bouquinistes
You will see these wooden storage compartments next to the sidewalk and bridges. You will find these along the Seine on both sides.
These are book vendors (also have other items for sale) that typically sell used and older books and magazines.
While brick and mortar shops are abundant, these vendors are part of the old style of selling in Paris.
We decided to buy some books from them.