Gonzalo Bilbao Martínez 1860–1938, Spain. https://www.artnet.com/artists/gonzalo-bilbao-martinez/ via : https://poramoralarte-exposito.blogspot.com/2017/06/gonzalo-bilbao-1860-1938.html https://poramoralarte-exposito.blogspot.com/2017/06/gonzalo-bilbao-1860-1938_7.html