http://audiobookscollection.co.uk/How-to-Solve-Word-Problems-in-Algebra/p228285/ || http://audiobookscollection.co.uk/fr/The-BCPL-reference-manual/p215479/ || http://audiobookscollection.co.uk/fr/The-Shadow-in-the-North-Aka-The-Shadow-in-the-Plate/p10564/