Notes on Coal and Iron Ore in the State of Guerrero, Mex. [With Note on the Azoic Age and Metamorphic Origin of the Iron Ore, by J. D. Dana]

Manross, N. S., & Dana, J. D. (1865). Notes on coal and iron ore in the State of Guerrero, Mex. [with Note on the Azoic age and metamorphic origin of the iron ore, by J. D. Dana]. American Journal of Science, s2-39(117), 309–312. https://doi.org/10.2475/ajs.s2-39.117.309