31 Newell, R.R. Kielman, D. Constandse-Westermann, T.S. Van Der Sanden, W.A.B. Van Gijn, A. 1990 An inquiry into the ethnic resolution of mesolithic regional groups: a study of their decorative ornaments in time and space Newell R.R., Kielman D., Constandse-Westermann T.S., van der Sanden W.A.B., van Gijn A., 1990 Leida Brill Me