Info source for 50 BMG?

Is there a recommended book or website specifically covering ammunition variants of the Cal .50 BMG (12,7 x 99)?

There is the great head stamp guide of Ron Fuchs (available here in the forum somewhere in digital for free). I do not recall any proper publication which is covering this huge field and would appreciate to have a book on this subject (anybody going to write one?). The best on US made .50 till 1945 is of course the book of H/W/S.

Thank you. I somehow missed Ron’s guide when I looked through the bibliography. I have now sent him an email asking how I can obtain a copy.