You are so right! I stop by this shop every time I am in San Francisco. One of the very best rare book shops in Northern California.
Best Rare Bookstore - 2010
Argonaut Book Shop
Careful where you step at Argonaut: There's probably a $500 book or six in those stacks by your feet. One false move could mean a swift kick to a first-edition Mark Twain, Bret Harte, or Jack London. The bookstore specializes in rare books with a San Francisco or California connection. Not only does it offer the works of local literary masters, but you can also find pictorials depicting, say, the history of Telegraph Hill (bet you didn't know that before Coit Tower was built, the peak sported a sign reading "WELCOME"). There's also a stunning collection of paper ephemera, including 19th-century maps and World War I propaganda art.
The Argonaut Book Shop was founded in 1941 in the heart of downtown San Francisco, and has been a family-run business ever since. The Argonaut was also a founding member (1949) of the Antiquarian Booksellers' Association of America (ABAA), the professional orangization of rare book dealers.
Since 1941 the Argonaut Book Shop has specialized in the History of California and the Far West and is very well known for those subject areas. The shop also offers fine books in many other subjects.