Fraction of the total SFR density at high redshift in lower luminosity LBGs (<0.3 L* _{z = 3} ), higher luminosity LBGs (>0.3 L* _{z = 3} ), and ULIRGs (>10 ¹² L _☉)). While there will obviously be some overlap between LBG and ULIRG selections, we consider the ULIRG population here separately since mid-IR/far-IR data are required to fully account for the SFR in these galaxies. The contribution of star-forming LBGs is included all the way down to zero luminosity. These fractions are derived based upon the discussion in Sections 5.4, 6.1, and 6.2, and estimates in Tables 6 and 7 and Figures 11 and 13. It is clear that virtually all the SFR densities at z 3-4 can be accounted for from LBG selections.