D G · D. Green · Doris M. Green
| title | ISBN-13 (ISBN-10) | year of publication |
|---|---|---|
| Explore Wisconsin Rivers | 978-1-934553-12-1 (1-934553-12-3) | 2008 |
| Minnesota Underground & the Best of the Black Hills: A Guide to Mines, Sinks, Caves, & Disappearing Streams | 978-1-931599-24-5 (1-931599-24-6) | 2003 |
| Wisconsin Underground: A Guide to Caves, Mines, and Tunnels In and Around the Badger State | 978-0-915024-85-8 (0-915024-85-3) | 2000 |