Guide to the caves of Minnesota
| Egile nagusia: | |
|---|---|
| Beste egile batzuk: | |
| Formatua: | Liburua |
| Hizkuntza: | English |
| Argitaratua: |
Minneapolis
University of Minnesota, Minnesota Geological Survey
1967
|
| Saila: | Educational series (Saint Paul, Minn.)
4. |
| Gaiak: |