Need to find that special gift for someone back home while in Paris or just looking for that one of a kind souvenir which can't be purchased just anywhere, then stroll along the banks of the Seine and you'll come across hundreds of green boxes.
For centuries, booksellers have had open stalls displaying antique literature ranging from the culinary arts to military history. Every dealer specializes in a specific genre and sells not just out of print books, but pamphlets, posters, magazines, journals, etc.
They open and close their "stores" as they please, so not all of them will be open every day. Don't anticipate bargain prices either, this isn't Barnes & Nobles.