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Starforts.com catalogs bastioned fortifications around the world and explains why artillery changed medieval walls into geometric defensive systems covered in triangles, ravelins, and overlapping fields of fire.
Patricia Seed's Rice University Latitude site uses maps and linked lessons to explain how latitude, navigation, astronomy, currents, weather, and cartography changed ocean travel.
Paul Hardy's personal site gathers decades of cartography papers, mapping work, traditional-music tunebooks and other specialist material that would otherwise be scattered across institutions and formats.