chemicals

The production brigade's small group for scientific research

The production brigade's small group for scientific research (1973, July)

Xiang Xiuli

Xiang Xiuli (1961, July)

Xiang Xiuli -- educational posters of heroic persons

Xiang Xiuli -- educational posters of heroic persons (1992, May)

Intellectual development

Intellectual development (1987, November)

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