The Industrialist's Manual No. 3, Rusty's Iron Foundry is part of a set of 21 manuals (AA 001 009-001 029) used in APEX (Air Pollution Exercise), a computerized college and professional level "real world" game simulation of a community with urban and rural problems, industrial activities, and air pollution difficulties. The first two sections, which are the same in each of the student manuals (volumes 1 to 19), contain general information about the APEX interaction simulation and a glossary of reference terms. The remaining sections contain the following: industrialist's role description; annotated industrialist's worksheet; a sample industrialist's worksheet; background information for industrialist's role; an annotated printout for cycle one; and a map of the 29 APEX analysis areas. The manual is identical to the other industrialist's manuals, except for the last two sections. The game simulation procedure and required computer facilities are further described in resumes for AA 001 009 and 001 010. (PR)