Chambers, S. M. & Steadman, D. W. (1988). Holocene terrestrial gastropod faunas from Isla Santa Cruz and Isla Floreana, Galápagos: evidence for late Holocene declines. Transactions of the San Diego Society of Natural History. 21(6): 89-110, figs. 1, 2A-L, 3.
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Chambers, S. M. & Steadman, D. W.
1988
Holocene terrestrial gastropod faunas from Isla Santa Cruz and Isla Floreana, Galápagos: evidence for late Holocene declines
Transactions of the San Diego Society of Natural History