That very blog post describes where they got their materials from, most of it comes from Retromags and out-of-print-archive. You can find downloads over at their sites, and those sites usually also upload to IA.
I don't think you can download directly from VGHF as that is not what it's intended for (it's a research tool)
I don't think you can download directly from VGHF as that is not what it's intended for (it's a research tool)