That work published in the 1880's by a German & translated by a very biased Greek-American anthropologist (if he can truly be granted the title) from California is a joke.
Dienekes is very heavily biased in all of his work as an anthropologist (I'm not sure of his qualifications as a professional anthropologist as I've seen him shamed by intellectual laymen on certain forums I'm a member of), something his inspiration, & predecessor, Coon, wasn't.
Racial Reality as a website has a heavy Mediterranean bias, it is mainly focused on 'refuting' what they consider to be 'myths.' Only Mediterranean subraces are covered through that site & the information from either Coon's
Races of Europe or
Origin of Races is misquoted to whitewash Mediterraneans.
Coon covered unfathomable ground, but much of his work has been proven false & incongrous by some modern DNA studies & new genetic technology.