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I have to confess my wife was kind enough to get me a signed copy of Guzziology a decade ago, I've not done more than skim a few sections because of the format.I'm sure it's chock full of knowledge, especially if wrenching on vintage Guzzis but it's not exactly a coherent read for the history of the brand.
Moto Guzzi Est 1921 Going out of business since 1922 Might be a good place to start Dusty
https://play.google.com/books/reader?id=24Z8AwAAQBAJ&printsec=frontcover&output=reader&hl=en&pg=GBS.PP1
Greg Field and Mick Walker have both written pseudo history books. MG Big Twins by Greg is best but out of print, look at Amazon for used.
Hate to say it, but I love that line as well as making electricians out of riders.Tom