Extract from:

AUSTRALIAN DENTAL JOURNAL 1970

… It was found that the fluoride concentration
of the Carnarvon water supplies varied  from
0.2 ppm to 2.0 ppm.  The 0.2 ppm fluoride was
found in river pools and when the river was
in flood this water was used primarily
for irrigation purposes … 

 Full text → HERE

 Full text → HERE

 Extract from:

AUSTRALIAN DENTAL JOURNAL 1970 

Numerous other studies on the same theme have
been undertaken in Western Australia

⇓  SEE ALSO ⇓ 

Fluoridation & Renal Disease in Aboriginal & Torres Strait Islanders

Fluoride, Cadmium, Arsenic & Kidney Failure – Sri Lanka

Fluoridation Targets Black Americans, Indigenous Australians+