A class in geology being taught by Professor Carl Elzchner, with instructor 46977 Sgt. Ray R. Tyrell, in the photograph taken by the photographer on 4-13-19.

---

Size: 8463px × 5718px
Photo credit: © piemags/NSC / Alamy / Afripics
License: Licensed
Model Released: No

Keywords: ., .., 188led, 46977, activities, american, army, carl, class, classroom, education, elzchner, equipment, era, field, formation, geological, geologist, geology, historical, history, instructor, instructors, lesson, military, photographs, prof, professor, ray, rock, sediment, sgt., soldiers, study, survey, training, trip, tyrell, uniform, war, world, ww1