Keywords: Mumford, Lewis Correspondence ; Geddes, Patrick, Sir Correspondence ; Mumford, Lewis *1895-1990* Correspondence ; Geddes Sir, Patrick *1854-1932* Correspondence ; Biographies (Autobiography) ; City planners Correspondence ; United States ; City planners Correspondence ; Great Britain ; Architects Correspondence ; United States ; Sociologists Correspondence ; Great Britain ; Social reformers Correspondence ; United States ; City planners United States ; Correspondence ; City planners Great Britain ; Correspondence ; Architects United States ; Correspondence ; Sociologists Great Britain ; Correspondence ; Social reformers United States ; Correspondence ; Briefsammlung 1915-1932 ; Briefsammlung ; Geddes, Patrick 1854-1932 ; Mumford, Lewis 1895-1990 ; Geddes, Patrick 1854-1932 ; Mumford, Lewis 1895-1990 ; Mumford, Lewis 1895-1990 ; Geddes, Patrick 1854-1932