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We measure the pressure and energy density of two flavor QCD in a wide rangeof quark masses and temperatures. The pressure is obtained from an integralover the average plaquette or psi-bar-psi. We measure the QCD beta function,including the anomalous dimension of the quark mass, in new Monte Carlosimulations and from results in the literature. We use it to find theinteraction measure, E-3p, yielding non-perturbative values for both the energydensity E and the pressure p. uuencoded compressed PostScript file Revisedversion should work on more PostScript printers.Comment: 24 page

β function and equation of state for QCD with two flavors of quarks