Javier Tusell's letter to Wenceslao Roces, and the reply

Javier Tusell, director-general of Fine Arts, writes to Wenceslao Roces, lecturer at the University of Mexico, and undersecretary of Public Instruction during the second Republic who was involved in Pablo Picasso's commission to produce the painting, to ask about the issue and whether documents related to Guernica and its creation have been kept.