The effort reported herein is concerned with civilian dual-use personnel shelters. Its primary objectives are: 1) to determine for nuclear weapons environments other than fallout radiation alone, the extent of the economic advantages of dual use shelter systems with respect to expected percent of population thus sheltered. 2) To bring into sharper focus those areas in which more research or analysis is necessary in order to increase the effectiveness of this sheltering concept. Topics supplementary to the above objectives include: estimated construction trends in selected grade separations as dual-use shelters, and cost estimating and cost reporting as applied to dual-use shelters. Results of this effort dealing with a large number of existing related topics are contained in this report. These results are in the form of assembled and updated costs as well as physical and environmental data and conclusions.