I have an incling of recollection that I once owned one of those Wash-Co maps.
If I find it, I could look into scanning it at full scale and post the pages.
The routes here on the west side heading into the hills can really get you turned around and utterly lost. It is very hilly and more and more, gated [not that this will stop a bike]. Eventually you will be dumped out on US 26 or US6 or wind up in Timber. I would definitely be sporting some MTB tires.