M.J. van der Meulen, W.E. Westerhoff, A. Menkovic, S.H.L.L. Gruijters, C.W. Dubelaar and D. Maljers 2009. Silica sand resources in the Netherlands. Netherlands Journal of Geosciences. 88, (Nov. 2009), 147 - 160. DOI:https://doi.org/10.1017/S001677460000086X.