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Start Over Subjects Congresses as Topic ✖Remove constraint Subjects: Congresses as Topic Genre Annotations ✖Remove constraint Genre: Annotations Copyright Copyright may apply ✖Remove constraint Copyright: Copyright may apply Dates by Range 1950-1999 ✖Remove constraint Dates by Range: 1950-1999 Publication Year 1990 ✖Remove constraint Publication Year: <span class="single" data-blrl-single="1990">1990</span>

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