Could this be Gertrude Vogel?
This may be Gertrude Vogel. A woman with this name is on the back of a photo of a group of people visiting a saltpeter cave in Dawsons Springs, KY in the 1930s. If the same person, this would place Gertrude in her mid 30s or so. This seems to be consistent with the person in this photo who appears to be in her 20s-30s.
Date & Place:
at Dawsons Spring, KY