Ryskamp, Peggy. “Tracing the Llavina Costa Family of Catalonia, Spain: Unexpected Findings in an Unexpected Source,” National Genealogical Society Quarterly 96(September 2008): 121-128.
This article tells how to do research in areas of Spain where the parish record have been lost.
In this case, the records of Granollers were destroyed during the Civil War. Thankfully, Spanish civil registration of births began in 1870, providing an alternative to baptism records. The doicesan archives contained communion records, which lists families by their mas, or farmhouse, including their relationship to the head of the household. Census records were also used to tie together the diocesan records and civil registration, confirming dates of migration. By examining these three record groups together, the researcher was able to piece together family relationships both for the focus generation and their spouses, their children, and their parents.