Any industry category listed in the Natural Resources Defense Council (NRDC) settlement agreement [(NRDC et al. v. Train, 8 E.R.C. 2120 (D.D.C. 1976), modified 12 E.R.C. 1833 (D.D.C. 1979)] for which EPA has or will develop effluent guidelines; also listed in Appendix A of 40 CFR. CFR: A codification of the final rules published daily in the Federal Register. Title 40 of the CFR contains the environmental regulations