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considering the impact of historical international events such as the Milan Congress (1880) and the linguistic recognition and documentation of signed languages in the 1960s and 1970s on the use of signed languages in education, and on deaf people’s feelings of ownership and pride in their languages
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http://rdf.australiancurriculum.edu.au/elements/2018/05/ce5eb53c-cd52-4b1e-8bc4-8331d589888e.rdf