| value | technique | year | title_of_literature<MAX120col.> | journal<MAX120col.> | vol | page | name<MAX80col.> |
| 0.09 | CALC |
1990.04 | Personal communication, Govern. Chem. Lab., Brisbane, Australia | | | | H.A.Olszowy, J.Hegarty, P.Smith, R.Sumner, S.Mckeo |
| <0.01 | UU |
1990.05 | Personal Communication, U.S. Geological Survey, Lakewood | | | | J.S.Kane, J.G.Crock, W.H.Ficklin, C.S.Papp and J.D |
| 0.57 | CHEM |
1990.05 | Personal Communication, U.S. Geological Survey, Menlo Park | | | | J.S.Kane, T.Fries and N.H.Elsheimer |
| 0.5 | CHEM |
1990.02 | Personal communication, Geological Survey of Canada | | | | D.C.Gregoire |
| 0.48 | CEA |
1990.04 | Personal communication, Govern. Chem. Lab., Brisbane, Australia | | | | H.A.Olszowy, J.Hegarty, P.Smith, R.Sumner, S.Mckeo |
| 0.14 | CEA |
1993.11 | Personal Communication, Toshiba, Japan | | | | M.Konuma and Y.Yokote |
| 0.030 | CHEM |
1994 | Personal Communication, Czech Geol. surv, Czech Republic | | | | I.Rubeska |