Archivo Diocesano de Zaragoza
This is one of the archives I know the best, having been a frequent visitor for many years. Aragonese ancestry can be as interesting as it is challenging to document. This area saw a distressingly high rate of destruction of parish registers during the 1930s, but today the Zaragoza Diocesan Archive has assembled and catalogued many record sets that could be just what you need to get past the brick walls. Contact me to discuss possible research there.