Looking for the traces of the last hunter–gatherers: Geophysical survey in the Mesolithic shell middens of the Sado valley (southern Portugal)

1. Arias, P.
2. Diniz, M.
3. Cubas, M.
4. Duarte, C.
5. Iriarte, E.
6. Salzmann, C.
7. Teichner, F.
8. Teira, L.