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http://ubu.artmob.ca/sound/russell_bertrand/Russell-Bertrand_Relativity_12-Conventions-and-Natural-Laws.mp3
http://ubu.artmob.ca/sound/russell_bertrand/Russell-Bertrand_Relativity_13-The-Abolition-of-Force.mp3
http://ubu.artmob.ca/sound/russell_bertrand/Russell-Bertrand_Relativity_14-What-Is-Matter.mp3
http://ubu.artmob.ca/sound/russell_bertrand/Russell-Bertrand_Relativity_15-Philosophical-Consequences.mp3