Vol. s5-23, Issue 138, 1932June 01, 1932 EDT
Calcareous "Pipes; in the Quaternary of Ecuador
Calcareous "Pipes; in the Quaternary of Ecuador
G. Sheppard,
Sheppard, G. (1932). Calcareous "pipes; in the Quaternary of Ecuador. American Journal of Science, s5-23(138), 497–500. https://doi.org/10.2475/ajs.s5-23.138.497