(2019) Supplementary figures for \"Depicting Grand Canyon’s rock layers: 150 years of visualizing and interpreting geology\"

Karl Karlstrom & Laura Crossey
These color and supplementary figures accompany the following reference: Karlstrom, K. E., and Crossey, L. J., 2020, Depicting Grand Canyon’s Rock Layers: 150 years of Visualizing and Interpreting Geology: in, Quartaroli, Richard, editor, Celebrating 100 Years of Grand Canyon National Park: A Gathering of Grand Canyon Historians: Ideas, Arguments, and First-Person Accounts, Symposium Proceedings of the Grand Canyon Historical Society, (Grand Canyon, Ariz.: Grand Canyon Conservancy, 2020, v. 5, chapter 31, pp. xx –xx.
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9 downloads reported since publication in 2019.

These counts follow the COUNTER Code of Practice, meaning that Internet robots and repeats within a certain time frame are excluded.
What does this mean?