An ongoing project is to extract information from historical documents and make it available on line in an easily searchable format.
Books (Historical) - A collection of historical books on Naval Architecture, Ship-Building, Naval Gunnery and related content you may find useful in your research. All books are public domain books acquired from around the internet.
The Harold M. Hahn Collection - Harold Hahn wrote many articles over the years. Some of the the Harold M. Hahn collection here at the Navy Board Models also includes his research notes as well as correspondence that you may find helpful in your research.