text: 11 Ibid., dix-huitieme annee, Supplement de juillet, aout et sep­ tembre 1963. 
analysis: The text appears to be a citation from a publication, likely a scientific or academic journal, referencing a specific issue or volume from July to September 1963. The use of French terms such as "dix-huitieme annee" (18th year) and "Supplement" suggests a publication that may be focused on a specific field or discipline. Given the lack of specific keywords or phrases related to economic development, natural resources, or other fields, it is unlikely that the text falls under one of the more specific categories.