20thcentury alcoholics amateurs'manuals casestudies designandconstruction developingcountries economicaspects germany governmentpolicy greatbritain greatbritainresidencesconstruction history houseconstruction housing housingpolicy income informalsector(economics) landsettlement latinamerica low-incomehousing mexico mexicocity northrhine-westphalia pennsylvania peru philadelphia politicalaspects poor publichousing recoverymovement rehabilitation rentsubsidies socialconditions socialsettlements squattersettlements substanceabusetreatmentfacilities th4815 welfarerecipients