Where can one find a list of matches between Barcelona and Madrid?

There is no one definitive list of matches between FC Barcelona and Real Madrid, as the two teams have faced each other on numerous occasions throughout their history. However, some potential sources for information on this topic include:

- The FC Barcelona official website: The club's website provides information on all of their past matches, including against Real Madrid.

- The La Liga official website: The Spanish league website also provides information on all past La Liga matches, including those between Barcelona and Madrid.

- The RSSSF (Rec.Sport.Soccer Statistics Foundation) website: The RSSSF is an independent organization that collects and maintains football statistics, including information on matches between Barcelona and Madrid.

- Wikipedia: The Wikipedia pages for FC Barcelona and Real Madrid provide information on their history and their encounters against each other.