Mike,
I was going to post something similar on the Flynn thread. Some of those were great, like the Merion No. 1 drawing. The style is similar to landscape architectural drawings I have seen at the time and its quite nice.
After seeing those, I went to my computer to see if I can develop a BW rendering style similar to that. So far, I haven't mastered its "stipple tool."
I know Keith Foster and a few others try to mimic that old style with their master plan drawings.