According to wikpedia. He was on the case back in 67.
On 3 June 1967, Hellyer flew in by helicopter to officially inaugurate an unidentified flying object landing pad in St. Paul, Alberta. The town had built it as its Canadian Centennial celebration project, and as a symbol of keeping space free from human warfare. The sign beside the pad reads:
The area under the World's First UFO Landing Pad was designated international by the Town of St. Paul as a symbol of our faith that mankind will maintain the outer universe free from national wars and strife. That future travel in space will be safe for all intergalactic beings, all visitors from earth or otherwise are welcome to this territory and to the Town of St. Paul.
It doesn't appear at all he got interested from reading a book. But he got interested because he was the governtment offical aware of it.
