Neolithic

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Nikitin on the Quaternary deposits of Russia and their relations to prehistoric man
A. A. Wright

American Journal of Science June 1893, s3-45 (270) 459-463; DOI: https://doi.org/10.2475/ajs.s3-45.270.459
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History of cavern exploration in Devonshire, England; Part II
W. Pengelly

American Journal of Science November 1877, s3-14 (83) 387-394; DOI: https://doi.org/10.2475/ajs.s3-14.83.387