Links:
[1] http://www.ub.edu/clasfroc/ca/roques-%C3%ADgnies/roques-plut%25C3%25B2niques-i-volc%25C3%25A0niques
[2] http://www.ub.edu/clasfroc/ca/roques-%C3%ADgnies/streckeisen
[3] http://www.ub.edu/clasfroc/ca/roques-%C3%ADgnies/roques-volc%25C3%25A0niques-la-classificaci%25C3%25B3-tas
[4] http://www.ub.edu/clasfroc/ca/roques-%C3%ADgnies/roques-volc%25C3%25A0niques-pirocl%25C3%25A0stiques-i-els-seus-components
[5] http://www.ub.edu/clasfroc/ca/roques-%C3%ADgnies/roques-hipabissals
[6] http://www.ub.edu/clasfroc/ca/roques-%C3%ADgnies/altres-roques