Prisma, monumento all'abbandono - La Voce di Rovigo
Viro Prisma - Maaseudun Tulevaisuus
Photos at Prisma - Lappeenranta, Etelä-Karjala
Illustrisimo Viro Ioanni Baptistae Colberto, marquis de Seignelay (1651-1690). "Marca Hispanica sive limes hispanicus". Book written in Latin by Pierre de Marca (1594-1662). In 1656 he was commissioned to formalise the border