  New measurements are reported on the deuteron spin structure function g_1^d.
These results were obtained from deep inelastic scattering of 48.3 GeV
electrons on polarized deuterons in the kinematic range 0.01 < x < 0.9 and 1 <
Q^2 < 40 (GeV/c)^2. These are the first high dose electron scattering data
obtained using lithium deuteride (6Li2H) as the target material. Extrapolations
of the data were performed to obtain moments of g_1^d, including Gamma_1^d, and
the net quark polarization Delta Sigma.
