In 2008, Philip Pells and Philip Hammon, the owner of Scenic World Katoomba, set up Philsquare Publishing as a means of producing books on aspects of technological history in New South Wales. In 2009, the two Philips published "The Burning Mists of Time". In 2011, Philip Pells published the book "The Sydney Opera House Car Park and The Double Helix" that records the story of the Sydney Opera House Car Park and expands to discuss the history of the use of double helix structures.

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