The book is Never for Want of Powder: The Confederate Powder Works in Augusta, Georgia and it has five authors, including Ted Savas.
The usual sort of project is to have multiple authors contribute an essay each on some much broader (easier, gassier) topic. Or to have one author bind up his easy-reading book reviews. On the table of historical elements, a collaborative monograph on a specialist subject represents the heaviest metal of all. And that's as good as it gets for deep readers.
I'll report back on this after looking over the galleys.