Geologists Bailey Willis and Robert T. Hill both attended a Johns Hopkins University field trip while they worked at the USGS. This photo, taken April 30, 1897 at Jefferson’s Rock, Harper’s Ferry in West Virginia, includes them both amongst their colleagues. Credit: Joseph S. Diller, USGS photo library.

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Geologists Bailey Willis and Robert T. Hill both attended a Johns Hopkins University field trip while they worked at the USGS. This photo, taken April 30, 1897 at Jefferson’s Rock, Harper’s Ferry in West Virginia, includes them both amongst their colleagues. Credit: Joseph S. Diller, USGS photo library.

Geologists Bailey Willis and Robert T. Hill both attended a Johns Hopkins University field trip while they worked at the USGS. This photo, taken April 30, 1897 at Jefferson’s Rock, Harper’s Ferry in West Virginia, includes them both amongst their colleagues. Credit: Joseph S. Diller, USGS photo library.

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