Les Gregor's map of common soils in the United States doesn't use pictures of dirt...  ...d that he asked each state for a "representative" soil . Many sent theirofficial state soils —which, wow, who knew that was a thing? Mich...  ...wow, who knew that was a thing? Mic...

Clinton N. Godlesky noticed that you can get souvenirs from every state, but those souvenirs are not necessarily made in that state -or even in the US! So he started collecting earth from states that he traveled through,...