Porvoo Old Town

Pfeifer, J. / International Federation for Housing and Planning | British Library Conference Proceedings | 1993

The Porvoo Agreement

Tanner, M. | British Library Conference Proceedings | 1996

Maintenance of buildings in Old Porvoo

Tallqvist, T. / Helsinki University of Technology; Centre for Continuing Education / National Board of Antiquities et al. | British Library Conference Proceedings | 1989

New Caverns at Neste Oy's Porvoo Works

Elsevier | 1986

Reconstruction and restoration of Porvoo cathedral

Rahola, Ulla | Online Contents | 2009