![](https://sopuli.xyz/pictrs/image/68bf8e9a-3973-4f5a-acc3-42a5a36ab9da.webp)
![](https://sopuli.xyz/pictrs/image/8237c39e-cb2b-45cc-a6a1-ce36f0f09ffa.jpeg)
- Map key (and split map copy): “Back Matter” PDF (19 MB) from the map + article at geoscienceworld.org
- Text explanation in article without map at USGS.gov (see page 7 of 28)
Unfortunately, I cannot find a non-rasterized digital version even though the original clearly was a digitally typeset document.
Wow, satellite photography sure has improved since 1965.