Head-marking languages and adpositions?

I'm very curious about how head-marking languages work.  I get the part
about marking the possessed object instead of the possessor, but what
about other types of heads?  Are there ever adpositions in these languages,
and if so, do the adpositions take marking?  (I'm thinking here of the
opposite of languages where the objects of adpositions are marked for case.)
If so, how?

If anybody has a grammar up of a comprehensively head-marking conlang,
pointers to that would be appreciated, too :)

Amanda

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