A few years old but I found it interesting....
http://www.scirp.org/journal/PaperDo...?paperID=40214
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Welcome to the Cave Diver's Forum.
Assessing Fecal Contamination in Groundwater from the Tulum Region, Quintana Roo, Mex
A few years old but I found it interesting....
http://www.scirp.org/journal/PaperDo...?paperID=40214
Sent from my iPad using Tapatalk
"Men wanted for hazardous journey. Low wages, bitter cold, long hours of complete darkness. Safe return doubtful. Honour and recognition in event of success."
Earnest Shackleton
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