I'm tippin' you'd rather have the SL70 now than have the book!!
I bought mine at a second hand store when I came to Melbourne in 1978 for about 75c I think, I had to endure 180 minutes a day on the train, so it is a well worn book...that's why I have decided to scan it bit by bit before it becomes useless. They fetch over $100 on ebay!!
Cheers,
Chris.