Manganese-free). 9S To survey treatment of sewage water by oxidising ponds, effects of sewage on the drainage network Inside and outside the buildings. To preserve the arch ltecture of certaIn areas In Cairo studying the problems of traffic and parking. Efficiency of management of large cities, evaluation of different suburbs, broad features of Egyptian cities of the year 2000 and probability of expansion on neighbouring desert. Building Materials: for rural housing units to avoid scraping top soli, red brick-substitutes; special concretes to suit local conditions and habitats, economics of using resin-reinforced concrete; use of mortar In building Industry and preservation of houses against termites. Economics of Construction: specifications for design and execution of concrete and metal structures accor­ ding to current standards; specifications for design and laying foundations and the effects of salt there upon. To study suitable construction methods and their economics. Maintenance of present buildings and methods to correct their structural defects to minimise risks of sudden col lapse and unnecessary fatal ltles. To evaluate conditions for using pre­ fabricated concrete structures as adapted to local conditions. 8. ~ Settlements; Encourage settlement, use natural resources and study architectural environment In the new settlements. To determine the basis for site-selection of new settlements, their size, economy (production and services}, environmental considerations. To preserve the urban heritage through Integrated renewal and replacement of old suburbs of historical value. To use new and renewable sources of energy. setting pipe-I lne networks of both water and sewage, best suited building materials and Industrialization policy to develop new settlements. To develop new settlements on Integrated economic basis, wei !-planned and fully-1 Inked with universities and research agencies. To plan phased-In development of new settlements. 96 9. Management An4 Economics: To help take the right decisions t.o correct the 
**Analysis**
The text appears to be focused on urban planning and development, with a emphasis on sustainable and efficient practices. It covers topics such as sewage treatment, building materials, construction economics, and settlement planning. These topics suggest that the text is related to the development and management of cities, which is often a key aspect of economic development and urban planning.

**Category**
Economic development, Natural resources and environment