I'm not sure whether "a typology of Germanic people" is the best term for Sander's intention in his portraits; that, most certainly, was not the context in which Sander put them.
I can only go on what little I know of Sander.
Certainly, the
effect of Sander's work is to create
a typology. I thought that was his intent, based
on my readings. Here are how one online source
characterizes his work:
"
Man of the Twentieth Century was Sander's
monumental, lifelong photographic project to
document the people of his native Westerwald,
near Cologne. Stating that "We know that people
are formed by the light and air, by their inherited
traits, and their actions. We can tell from appearance
the work someone does or does not do; we can read
in his face whether he is happy or troubled," Sander
photographed subjects from all walks of life and
created a typological catalogue of more than six
hundred photographs of the German people."
http://www.masters-of-fine-art-photography.com/02/artphotogallery/texte/sander_text.html
If I have mischaracterized Sander's intent, then I
stand corrected (though I would like to understand
the basis for the correction). But my larger point
remains a fair one. Certainly the effect of Sander's
collection of his portraits into a single work is to give
them a context that illuminates them, in ways that
any one of them does not when standing alone.