Observations of 57 extragalactic sources at 10," are presented. Several of the brightest sources were observed from 2 to 25 ,". The observed range of lower limits to the infrared luminosities for galaxies extends from 10"' to 1038 watts. The infrared and radio spectra of the nuclei in Seyfert and related galaxies appear to be causally related.
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Rieke et al. (1972) studied this question.