Solution to the Hallopus enigma?

Jay J. Ague; Kenneth Carpenter; John H. Ostrom

doi:10.2475/ajs.295.1.1

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Ague, J. J., Carpenter, K., & Ostrom, J. H. (1995). Solution to the Hallopus enigma? American Journal of Science, 295(1), 1–17. https://doi.org/10.2475/ajs.295.1.1

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Solution to the Hallopus Enigma?