Essink , K., A.P. Oost, H.J. Streurman, and J. Van der Plicht. 2016. “Are Medieval Mya Arenaria (Mollusca; Bivalvia) in the Netherlands Also Clams before Columbus?”. Netherlands Journal of Geosciences 96 (May):9-16. https://doi.org/10.1017/njg.2016.17.