Glad to have stumbled on this -- I hadn't actually heard of two of the older books. If anyone stumbles on a source for the "Postmortem Examination - Specific methods and procedures" text, I'd be happy to hear about it (Amazon nor Alibris seem to have a hit).
For basic texts, though, I'm somewhat surprised the CAP sources haven't been mentioned. Try
www.cap.org and weave your way through the publications tab to autopsy sources. In addition to some free PDF's and several publications, there are three I think of particular interest -- two laminated technique booklets and one performance & reporting text. They may be the more basic/fundamental style people without much autopsy experience or demand may find most useful and least overwhelming.
Unfortunately a lot of autopsy "training" these days seems geared towards grossing in the body for microscopic exam, and/or cutting things just because. People largely learn by watching someone else do it, or by being left alone long enough they figure out a way to get by entirely on their own, rather than by learning standardized practices. Fortunately there are a lot of ways to do it and get an acceptable, if not always ideal, result.
Finkbeiner's book and the more recent Ludwig book "Handbook of Autopsy Practice" I have, but honestly rarely use except for the standard measurement tables in the back. Occasionally they're useful for academic purposes or to read about something uncommon, but usually I go for a text or paper specific to that abnormality.