References
- Amer. Soc. Testing Materials . 1961 . 1960 book of ASTM Methods for chemical analysis of metals , Philadelphia , PA : AMSTM .
- Haynes , C. V. 1980 . Paleoindian charcoal from the Meadowcraft Rockshelter: Is contamination a problem? . Amer. Antiquity , 45 : 582 – 587 .
- Hesse , P. R. 1971 . Soil chemical analysis , Chemical Publishing Co., Inc. .
- Jackson , M. L. 1958 . Soil chemical analysis , Englewood Cliffs , NJ : Prentice‐Hall, Inc. .
- Rankama , K and Sahama , T. G. 1949 . Geochemistry , 912 Univ. Chicago Press .
- Willard , H. H. and Furman , N. H. 1940 . Elementary quantitative analysis , New York : D. Van Nostrand Co., Inc. .