Thanks guys.

I'm reading a real book, not a scan on-line.  It is the 2nd edition, published in 1980.  I'm glad it was changed in a later edition.

Orlando had a good link that appears to explain exactly what was in the book.  I still think the Author should have had a footnote explaining the notation, but no point trying to complain now since he died back in the nineties.

Thanks again.

CRS