About as relevant as it gets: http://archive.org/details/DrWilliamPierceAudioArchive308RadioBroadcasts
http://www.natvan.com/free-speech/fs0109a.html
Sir Arthur Keith works mentioned by Dr. William Pierce here:
http://arthurkeith.wordpress.com/a-new-theory-of-human-evolution/
http://www.bearfabrique.org/Evolution08/evolution-and-ethics.html