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We propose a far-IR study of a complete and well-defined sample of radio sources from the B3VLA survey. The scientific goals of this investiga- tion are to constrain the relative importance of AGN and starbursts in high-redshift radio galaxies, and the unification models of quasars and powerful radio galaxies. We wish to use the far-IR (FIR) luminosities of these objects, in conjunction with the existing and soon to be obtai- ned ground-based radio, optical, and near-IR data, in several statisti- cal tests. While previous work based on the IRAS satellite data has concentrated on the FIR properties of pure starbursts and QSOs, very little is known about the FIR properties of radio galaxies, or indeed radio-selected samples in general. Our proposed observations would close this gap in a systematic manner, while addressing several inter- esting scientific goals. They will also constrain the evolution of the radio-loud populations over a substantial baseline in redshift, an important measurement on its own. There is a real possibility of disco- very of a new population of high-z starforming (proto)galaxies, similar to the ultraluminous source IRAS F10214, or even some completely new type of objects. Specifically, we propose to use PHOT for a photometric survey of a subsample of 400 radiosources from the B3VLA sample, which is complete down to 100mJy at 408 MHz. The subsample is at high lati- tudes, and close to the Lockman hole, so that confusion due to cirrus should be minimal. It has been extensively studied with VLA maps in 3 configurations, and flux measurements at several frequencies, ranging from 0.15 to 10.6GHz, and with mm observations planned in 1995. Optical IDs from POSS prints and new CCD work from Palomar exist for a large fraction of this sample, with an ongoing efforts to identify the rest. Redshifts have been measured for all quasars in the sample, and several tens of radio galaxies, ranging up to z=3.2 so far. The sample spans a large dynamical range in redshift and in radio power, which makes it nearly unique for studies of systematic trends in both of those axes.