I discovered a couple of old HL articles I've saved in the past. Sadly, I haven't saved from VERC but one: Bump mapping. It has the images, so you can add them to the existent version on TWHL.
There are a couple of other goodies I included, like "cs skylist" and a "rock tutorial" saved from 69th Vlatitude, a site long gone now.
Linky
I also wanted to include a PDF I had saved, although never studied, but I found it googling: .MAP files
file format description,
algorithms, and code.
I also made a screenshot on the SvenCoop forums in 2008 I think, when I wanted to make a svencoop campaign but had problems with too many entities: