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Published online by Cambridge University Press: 07 August 2017
We present results of number count studies of IRAS deep Pointed Observations and the new Faint Source Survey. Since number counts are dominated by the population near the knee of the luminosity function, the results refer to starburst and active galaxies with typical luminosities L60 ∼ 1010.5–11L⊙ and Lir/Lb, ∼ 3, and not to ‘normal’ spirals or the ‘ultraluminous’ IR galaxies.