In addition to documenting late-antique diagrams, this portal is home to some useful miscellaneous research compilations:
The author has also compiled several handbooks which are available via Academia.edu or ResearchGate:
From booksellers, online and streetside, you can buy:
The latter is a highly readable account from the beginning of how research brought the late antique Great Stemma to light.
The Library of Latin Diagrams by Jean-Baptiste Piggin is licensed under a Creative Commons Attribution-ShareAlike 4.0 International License.