This is what you want Gary
https://pubs.er.usgs.gov/publication/ofr97536A
https://www.nps.gov/subjects/caves/k...aphy-model.htm
I have built the colored version that is available at the NPS site, it is a different building method than what we are used to, but overall, the model is a good one, and depicts what the various bits of Karst topography are