The Gallica scans are linked in the wikipedia article. Each of those chapters has hundreds of pages.

I went through a bit of it and saw no instance of the symbol. If it's in there, would you mind saying which chapter and which page? Or some hint about what context people could find it in? The maps I saw (maps were pretty easy to find, too, since most of the page numbers for them are "NP") didn't seem to use this symbol.