Sam Ziff published before Huggins; he had a PHD in Nutrition and interviewed a mercury free dentist and got case studies before and after Amalgam removal.
I liked Huggins too. Found out I have some notes from Cutler's book along the lines of a half life of mercury of 60 days in the body as measured by micrograms of Hg in urine secretions (per 24 hr period).
I have more books on my scavenger list that I have not read. If you get deep into study you might be looking up the meanings of medical terms and trying to figure the anatomy of the brain and looking at photos of brains that shrunk as brain cells died after exposed to mercury. Mercury kiled brain and nerve cells whether as mercury vapor, mercury salts, or as mercury bonded with organic molecules.