The subtitle of is Weapons, Tools, and Gear for the Questing Knight, Barbarian Horde, or Learned Scholar . It covers human history from the Paleolithic era (40,000 BCE) up to the Renaissance (circa 1500 CE).
The official PDF from Warehouse 23 is fully bookmarked, allowing you to jump from the table of contents to "Hoplite Shields" in one click. gurps low-tech pdf
GURPS Low-Tech PDF is a 160-page supplement for the GURPS Fourth Edition The subtitle of is Weapons, Tools, and Gear