Fermilab-Tevatron. Measurement of the cross section for the production of isolated photons with transverse energies above 10 GeV and pseudorapidities less than 2.5 in (pbar-p) collisions at c.m. energies of 1800 GeV. The data come from the 1992-95 running period and have an integrated luminosity of 107.6 pb-1. See text of paper for details of photon isolation criteria.