robert-hill_field-trip_med.jpg
By Oklahoma-Texas Water Science Center
June 1899 (approx.)
![Robert Hill Field Trip 1899](https://d9-wret.s3.us-west-2.amazonaws.com/assets/palladium/production/s3fs-public/styles/full_width/public/media/images/robert-hill_field-trip_med_1.jpg?itok=nybfdBgs)
Detailed Description
Robert Hill, Father of Texas Geology, on Rio Grande field trip, Val Verde County, TX
Sources/Usage
Public Domain.