Photograph of the engraved schist slab from Molí del Salt (all images courtesy Manuel Vaquero Rodríguez) Seven crude semicircles scratched into the surface of an ancient stone slab may not make much ...

"Prepared in co-operation with the International Federation of Landscape Architects." https://siris-libraries.si.edu/ipac20/ipac.jsp?&profile=liball&source ...