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U. S. Geological Survey

Published online by Cambridge University Press:  03 June 2021

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Abstract

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Type
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Copyright
Copyright © The American Journal of Science

References

1 Reference standard for early samples was 19th-century wood, not significantly different (ref. 22, p. 86) from 0.95 x NBS oxalic acid.

2 Listed originally as “possibly older”.

3 Ratio, activity of sample to activity of wood standard.

4 Less than 2% of modern activity.

5 4.2% of modern activity.

6 Sample published twice with different titles.

7 Published, by typographic error, as W-1135.

8 Also published in ref. 178, p. 390.