Interesting old automotive book

Stopped into a thrift store today with the wife after a doctors appointment. Came across this cool old book. It's called National Service Data book. It was the 1949 book and looked like it covered all makes and models up to 49. It was a good 9+ inches thick. Was this maybe a precursor to the Motors manuals? They wanted $38. If it was a little cheaper I probably would have gotten it. Thought fabo folks would find it interesting. Very detailed sections on ignition systems, brakes, carbs, etc.

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