BIR6039495:
Roman Amphitheatre of Tomen-Y-Mur, Ffestiniog, Wales, 1943 (w/c, bodycolour, indian ink and wax crayon), Piper, John (1903-92) / Bridgeman Images
CH657160:
Two Heads - Design for a stained-glass window, (watercolour, gouache, wax chalk and brush on paper), Piper, John (1903-92) / Bridgeman Images
CH826736:
The Arch of Constantine and the Coliseum, Rome, 1961 (pencil, watercolour, coloured crayon and bodycolour), Piper, John (1903-92) / Bridgeman Images