Post Hip Obscurity

Spruce, being strong and light, is a popular wood for building light aircraft. During WWI the government decided they needed more than they could get from commercial suppliers, so they built a couple of logging camps, complete with sawmills and railroads in the Northwest. (Wikipedia has the whole story.) After the war they were no longer needed, so they were put up for auction. Scott came across a  bid document which included this flyer. The bid document is a perfect bound book of letter size paper about a half inch thick. All the pages were yellowed as you would expect from a document that is pert near a hundred years old. The paper of this "B" size flyer is still perfectly white. It's almost like tracing paper, you can see the dark background beneath the lower half, and a dark square showing through the upper half. I think it must be a picture on the following page.
Click to embiggenate. It will be large enough to read.