IN the early summer of 1981 an ornithologist and four assistants excitedly descended on Yaojiagou, a remote village of only seven households in the Qin-ling Mountains of northwest China's Shaanxi...
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IN the early summer of 1981 an ornithologist and four assistants excitedly descended on Yaojiagou, a remote village of only seven households in the Qin-ling Mountains of northwest China's Shaanxi...