Friends of the San Francisco Maritime Museum Library run a used and duplicate book sale located on the third floor of the park's administration building.
Book sale location:
Did You Know?
Loading ports are small, watertight doors in a ship's hull that lead directly into the hold. Lumber could be more easily loaded into the hold through these ports rather than through the smaller hatches on the deck. These ports had to be caulked shut before the ship put to sea. More...