We present full-polarization VLBA maps of the ground-state, main-line, ^2^{Pi}3/2, J=3/2 OH masers in 18 Galactic massive star-forming regions. This is the first large polarization survey of interstellar hydroxyl masers at VLBI resolution. A total of 184 Zeeman pairs are identified, and the corresponding magnetic field strengths are indicated. We also present spectra of the NH_3_ emission or absorption in these star-forming regions.
Cone search capability for table J/ApJS/160/220/table1 (Observed sources)