by Laurie Gough [Penguin Group (Canada) - 2006]
ISBN-13: 978-0143056157
ASIN: 0143056158
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The book is entitled "Kiss the Sunset Pig" by Canadian author Laurie Gough. It is a travel book about Laurie's trip by car from Ontario, Canada to California. I'm sorry I don't have the book anymore to give you exact references to Joni Mitchell in the book but the title is of course relevant - and questioned by the author in the book as to the exact origin and meaning of the phrase.