6 INDUSTRIAL AND FERTILIZER GRADE UREA PRODUCTS-NAMELY, AMMONIA, AND AMMONIA PRODUCTS, SAID PRODUCTS BEING UREA AND NITROGEN SUBSTITUTED AROMATIC COMPOUNDS-NAMELY, NITROBENZENE, ANILINE, DI-PHENYLAMINE, O-NITROTOLUENE, N-NITROTOLUENE, P-NITROTOLUENE, AND O-TOLUIDINE