English: The Yale world map of 'Henricus Martellus Germanus' (Heinrich Hammer), probably from Florence 1490-92. It is the most detailed 'Dragon Tail' map by Martellus. It is the only one with
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A Very good guide for map makers of all levels! Very good to refer to when designing a layout : r/hammer
Basic Construction - Valve Developer Community
Random Hammer Map Generator : r/hammer
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To-scale map of the Aperture Science Enrichment Centre (Using the Hammer Editor) : r/Portal