How to Optimize a Map in Hammer Editor: 10 Steps (with Pictures)
Using Lightmaps [Source Engine] [Tutorials]
Steam Community :: Guide :: Source SDK Hammer Tool Guide For Gmod
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
Intro to Source Mapping: Navigating Hammer and Making Brushes | Valve Developer Union
Source SDK: Hammer Source Player Scale and World Dimensions
To-scale map of the Aperture Science Enrichment Centre (Using the Hammer Editor) : r/Portal
Steam Community :: Guide :: Source SDK Hammer Tool Guide For Gmod
A Very good guide for map makers of all levels! Very good to refer to when designing a layout : r/hammer