Monthly public opinion surveys no. 160, 161, 162, 1969
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https://abacus.library.ubc.ca/dataset.xhtml?persistentId=hdl:11272.1/AB2/MJKKQX
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资源简介：
Indian Institute of Public Opinion, 1980, "Monthly public opinion surveys no. 160, 161, 162, 1969", https://hdl.handle.net/11272.1/AB2/MJKKQX, Abacus Data Network, V1
