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Testing the Head of List Elements

I'm something of a newbie with Mathematica; please excuse my ignorance.

I am looking for a clever way to select elements from a list based on their
type (Head).  Specifically, I want to extract all the elements of type
dtring from a list of elements of different types (string, number,
character, etc.).

Any suggestions?

Marshall Bartlett
Department of Geology and Geophysics
University of Utah
mgb_news at

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