  The deuterium abundances inferred from observations of the interstellar
medium within 1-2 kpc of the Sun range over a factor of three and the
corresponding oxygen abundances show an even larger dispersion. While the lower
D (and O) abundances likely result from depletion onto dust, the higher D
abundances are consistent with the BBN-predicted primordial D abundance and
chemical evolution models of the Galaxy with infall of primordial or nearly
primordial material. The large ranges in deuterium and oxygen abundances
suggest that the effects of depletion and/or infall have not been homogenized
in the local interstellar medium.
