Scientific examination of classic Spanish stamps with colour error, a non-invasive micro-Raman and micro-XRF approach: The King Alfonso XIII (1889-1901 "Pelón") 15 cents definitive issue

1. Castro, K.
2. Benito Ábalos, null
3. Martínez-Arkarazo, I.
4. Etxebarria, N.
5. Madariaga, J.M.