Illustrations that get almost a full page

Since I'm planning on self-publishing my Environmental History textbook, I'm being very careful to use only illustrations from Creative Commons sources. It's not that hard, since I've already accumulated hundreds of images for each of my chapter topics, to use in my video lectures. But I'm trying to hold myself to a stricter level of sourcing for the book, take down the url of the source, etc.

Most of the images will become basic illustrations, occupying at most four of the "columns" I use as placement guides in the app (InDesign). A few seem so important that I'm giving them eight columns -- letting them extend from margin to margin across the top of a page. One is the diagram of the Grid produced under the National Land Ordinance, from
Wikipedia's "Land Ordinance of 1785" page:

1785_land_ordinance_diagram

I include that one not only because I think it's incredibly important that people understand why the land they see while flying over America looks the way it does, but because until I moved to the country, I never knew what the dimensions of an acre were or how many there were in a square mile. Appalling.

The second image, so far, that I've given a full spread across the page is Henry Gannett's census map of Government Land Grants. I got my copy direct from the out-of-copyright book (it's b&w because all my illustrations have to be, to make the book affordable to publish), but you can see it on
David Rumsey's excellent map website. This one gets the full spread because there's a lot of detail, and because one of the themes of the text has to do with the relationship between the public and private sectors. And again, because people just don't remember this stuff.

govt-land-grants-railways-1880-reduced

Edit: I almost forgot, this one too (although also in b&w):

03169v