Assessment of the state of conservation of a Middle Neolithic flint mine in Maastricht limestone, Valkenburg (Limburg). Bulletin KNOB, [S. l.], v. 108, n. 5-6, p. 165–172, 2009. DOI: 10.7480/knob.108.2009.5-6.163. Disponível em: https://bulletin.knob.nl/index.php/knob/article/view/vanHees165. Acesso em: 21 apr. 2026.