: Focuses on public domain works. It includes classic titles such as Armour & Weapons .
: This is one of the most extensive resources. You can find high-quality scans of books like Weapon: A Visual History of Arms and Armor and various volumes of the Gun Digest series.
These platforms host historical treatises, encyclopedias, and classic texts whose copyrights have expired.
For technical data, military manuals, and official histories, these sources are highly reliable. Project Gutenberg
: A project of the Internet Archive that allows you to "borrow" digital copies of specialized books, including those on firearms design . 2. Specialized Military & Historical Repositories