Thus a coal stratum found in one locality may not be exactly on the same stratigraphic level as another found not far distant, but both were laid down during a period when the general depositive conditions were the same; […]
The supplementary bibliography (in Vol. VI) attests to the comprehensiveness of the effort.
to burn a hole; to burn letters into a block
Survivor bias commonly weakens observational studies, even those published in premier journals. It occurs because patients who live longer are more likely to receive treatment than those who die early.
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