  We report measurements of the asymmetry A_parallel for inclusive hadron
production on longitudinally polarized proton and deuteron targets by
circularly polarized photons. The photons were produced via internal and
external bremsstrahlung from an electron beam of 48.35 GeV. Asymmetries for
both positive and negative signed hadrons, and a subset of identified pions,
were measured in the momentum range 10<P<30 GeV at 2.75 and 5.5 degrees. Small
non-zero asymmetries are observed for the proton, while the deuteron results
are consistent with zero. Recent calculations do not describe the data well.
