Plots showing the number of water samples collected over time (top) and by location (bottom) in the Yellowstone region since the late 1800s

Plots showing the number of water samples collected over time (top) and by location (bottom) in the Yellowstone region since the late 1800s. Yellowstone’s archive of water-chemistry research data is a mosaic of scientific progress, built with the work of hundreds of people over more than a century and still growing today.