Vol. 268, Issue 2, 1970February 01, 1970 EDT
Age of Plant Fossils From the Worcester Coal Mine, Worcester, Massachusetts
Age of Plant Fossils From the Worcester Coal Mine, Worcester, Massachusetts
Edward S. Grew, Sergius H. Mamay, Elso S. Barghoorn,
Grew, E. S., Mamay, S. H., & Barghoorn, E. S. (1970). Age of plant fossils from the Worcester coal mine, Worcester, Massachusetts. American Journal of Science, 268(2), 113–126. https://doi.org/10.2475/ajs.268.2.113