Guide to the caves of Minnesota
| मुख्य लेखक: | |
|---|---|
| अन्य लेखक: | |
| स्वरूप: | पुस्तक | 
| भाषा: | English | 
| प्रकाशित: | Minneapolis
          University of Minnesota, Minnesota Geological Survey
    
        1967 | 
| श्रृंखला: | Educational series (Saint Paul, Minn.)
              4. | 
| विषय: |