WIA GC/1910/257 | Hauser, Philippe to Hauser, Lionel 12/01/1910 | summary of his travel to the Escorial; postscript that the photographic order is on its way... |
WIA GC/1910/259 | Hauser, Philippe to Warburg, Aby 07/12/1910 | thanks him for Warburg's articles; informs him that he was told by the monks in the Escorial that... |