The Côa valley in northern Portugal has been a focus of archaeology for the past few years, first because of two bungled surveys and the subsequent threat of inundation, then because of the reported age estimates of its rock art, and later because of accusations of state-funded archaeological vandalism

Encompasses an important array of rock-shelters with prehistoric paintings. Illustrated description of the site, its rock art and the Paleolithic period, with visitor information.

The Museu Monográfico de Conimbriga manages the ruins of the Roman city. It gives an outline history, plan and aerial photographs of the site.

A substantial, illustrated summary of a book by Raquel Vilaça (1997), with brief bibliography.

The Cultural Heritage and Sciences research group provides radiocarbon dating and other laboratory analysis of historic and prehistoric artefacts.