Book out on Halton Arp. It includes the story of his disagreement about the nature of red shift. The editors are Martin Kokus and Christopher Fulton. The title is 'The Galileo of Palomar: essays in memory of Halton Arp' priced at £10.50 on Amazon. Robert Farrar provided the link – www.amazon.co.uk/Galileo-Palomar-essats-memory-Halton/dp/1987980077/ref=… …. and at that price well worth a read as Halton Arp plays an important role in astronomy, the man that challenged the red shift consensus.