The problem is that it's absurd to label everything either "conservative" or "liberal," "rightwing" or "leftwing."
Sometimes a bad idea is just a bad idea, not owned by an idealogy.
Look, tons of their garbage is still on the net. It was submitted as "evidence" to the various highway design control agencies at public hearings.
You might read it; see if you find something familiar; then give the originator a call and see where she first got it.
There's some truly amazing stuff in there, particularly the part about Indian villages still extant on top of barren limestone quarries.
Human Events probably ought to see if some of that stuff they published was plaigerized too ~ nothing like a copyright violation to put money in somebody else's pocket you know.