I understand, but there is a tendency to underestimate the time required for research. For the S-G book - one which is much shorter than a comparable Liberty DE book - I had source materials collected over the previous decade+ and it still required over a year to fill gaps, correlate, and add new research. From my perspective, the 1st edition is superficial and largely repeats prior knowledge. Like all the other Guide Book series, it is intended as a general introduction and reference, not anything comprehensive. Printing pricing in a book is always a questionable practice - it automatically outdates the day the book hits shops. In the Liberty DE book, prices are more of a relative indicator for future use.