what is the typeface:
in the pdf document it says 'Caslon Buch, Fotosatz' http://www.letterror.com/noordzij/stuff/Kind%20und%20Schrift.pdf
in pdf > fonts it says 'SuduX050–Roman'
where can one buy it from
Typophile
(x) Gerrit Noordzij – Kind und Schrift typeface - Sudum (unpublished) {Pieter}
It could be one of the fonts Gerrit Noordzij has created for his own use. His son Peter Mathias is the founder of The Enschedé Type Foundry (http://www.teff.nl/index.html) and as far as I know they are going to publish some of these fonts. Ruse is one that's available now (but not similar to your sample).
The typeface is called Sudum and is done by Gerrit Noordzij and as yet unpublished.
Pieter
It has the gorgeous mark of Gerrit's hand.
Héctor
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