We retrieve mixing ratio profiles of O3, H216O, H217O, H218O, HF, and HCl from far-infrared thermal emission observations of the limb in the 80--220 cm-1 spectral region. The observations were made with a balloon-borne Fourier transform spectrometer as a part of the 1983 Balloon Intercomparison Campaign (BIC-2). A subset of the data was analyzed previously using the method in the work of Traub et al. <1982,1991>; in the present paper we use an alternative method of calibration and analysis, given by Abbas et al. <1985>. The retrieved constituent profiles are compared with the measurements made with other instruments on the BIC-2 flights. The results for the concentrations of H217O and H218O obtained in this study indicate no isotopic enhancement or depletion with a standard deviation of about 20%. ¿ American Geophysical Union 1992