In the background Herb 's maps of the cave .
Dwight Deal , Jan and Herb Conn in the Visitor 's Center of Jewel Cave National Monument in 1989 on the 30th anniversary of the Deal - Conn exploration effort .
In the background Herb Conn 's maps of the cave .
Dwight Deal , Jan and Herb Conn in the Visitor 's Center of Jewel Cave National Monument in 1989 on the 30th anniversary of the Deal - Conn exploration effort .