I had no intention of playing down his work. In fact, I'm grateful the book exists. However, I do have a problem with the job the editors did: lousy proof-reading. There are so many errors in the production numbers that I see as being a result of transcription errors and typos, that they could (and should) have been weeded out by the time the 3rd Edition appeared.
With respect to completeness, I have no problesm accepting the fact that it only shows information that was available at the time and cannot contain information that was discovered later. This is the main reason why I suggested taking the information with a grain of salt and contacting the historical archive for the latest (and best) information about a specific car or model.
I heard about d'Amico & Tabucchi's book that there is/was a 3rd tome with corrections. However, I never saw it and therefore do not know if that information is correct. The new and revised edition is curently scheduled for publication in 2007, see
here.