His student Alan Glennon discovered an entrance and made significant discoveries to the Martin Ridge Cave System, Kentucky (51.8 kilometers long).
Frank Sinatra | Michael Jackson | Frank Zappa | Order of St Michael and St George | Frank Lloyd Wright | Michael Bloomberg | Michael Jordan | Michael Caine | Michael | Michael Palin | Michael Moore | George Michael | Frank Capra | Michael Dukakis | Frank Gehry | Michael W. Smith | L. Frank Baum | Michael Douglas | Michael Bolton | Michael Schumacher | Michael J. Fox | Michael Bublé | Frank Stella | Frank | Michael Faraday | Michael Moorcock | Michael Kors | Michael Brecker | Michael Bay | Michael Nyman |
In 2005, an ESRI ArcGIS version of the software, inspired by Tobler, was developed by Alan Glennon and Michael Goodchild at UCSB.