Template:Cooper et al., 1942
- Cooper, G.A., Butts, C., Caster, K.E., Chadwick, G.H., Goldring, W., Kindle, E.M., Kirk, E., Merriam, C.W., Swartz, F.M., Warren, P.S., Warthin, A.S. & Willard, B. 1942. Correlation of the Devonian Sedimentary Formations of North America. Geological Society of America Bulletin 53(12): 1729–1794, 1 Pl.