  Using 55.8 pb^-1 of e^+e^- collisions recorded at the psi(3770) resonance
with the CLEO-c detector at CESR, we determine absolute hadronic branching
fractions of charged and neutral D mesons using a double tag technique. Among
measurements for three D^0 and six D^+ modes, we obtain reference branching
fractions B(D^0 -> K^- pi^+)=(3.91 +- 0.08 +- 0.09)% and B(D^+ -> K^- pi^+
pi^+)=(9.5 +- 0.2 +- 0.3)%, where the uncertainties are statistical and
systematic, respectively. Final state radiation is included in these branching
fractions by allowing for additional, unobserved, photons in the final state.
Using a determination of the integrated luminosity, we also extract the cross
sections sigma(e^+e^- -> D^0 \bar D^0)=(3.60 +- 0.07 +0.07-0.05) nb and
sigma(e^+e^- -> D^+D^-)=(2.79 +- 0.07 +0.10-0.04) nb.
