The document discusses several land use models:
1. Concentric zone theory proposed by Ernest Burgess divides a city into concentric circles - central business district, transition zone, working class zone, residential zone, and commuter zone. Population density and socioeconomic status decrease with distance from the city center.
2. Sector theory by Homer Hoyt describes cities growing along transportation routes rather than concentric circles.
3. Multiple nuclei theory by Harris and Ullman sees cities having multiple centers of activity rather than one central business district.
4. Mann's model combines aspects of concentric zone and sector theories, dividing cities into four socioeconomic sectors, each with inner and outer zones reflecting land use patterns