Titov, OlegPursimo, TJohnston, H. M.Stanford, Laura MHunstead, RichardJauncey, DavidZenere, Katrina A.2020-12-202020-12-200004-6256http://hdl.handle.net/1885/218291In extending our spectroscopic program, which targets sources drawn from the International Celestial Reference Frame (ICRF) Catalog, we have obtained spectra for ∼160 compact, flat-spectrum radio sources and determined redshifts for 112 quasars and radio galaxies. A further 14 sources with featureless spectra have been classified as BL Lac objects. Spectra were obtained at three telescopes: the 3.58 m European Southern Observatory New Technology Telescope, and the two 8.2 m Gemini telescopes in Hawaii and Chile. While most of the sources are powerful quasars, a significant fraction of radio galaxies is also included from the list of non-defining ICRF radio sourcesapplication/pdfen-AU201710.3847/1538-3881/aa61fd2020-11-23