Analysis of information sources in references of the Wikipedia article "Di chỉ người Bắc Kinh tại Chu Khẩu Điếm" in Vietnamese language version.
The scientists who worked on the excavation rode to the site on mules and stayed in an old caravansary. The first skullcap was dug out by Pei Wenzhong working in a 40-meter crevasse in frigid weather with a hammer in one hand and a candle in the other.
Black died at his office desk in the middle of the night with a skullcap of Peking Man beside him.
Three Chinese workers at the site were tortured and then bayoneted to death by Japanese soldiers, and one worker was forced to drive a rickshaw and died of starvation.
In February 1918, Johann Gunnar Andersson, a famous Swedish geologist and archaeologist, was told that there were some fossils at what was called Chicken-bone Hill near Zhoukoudian. He was then serving as an adviser on mineral affairs in the Ministry of Agriculture and Commerce of the Chinese Government. He showed much interest and, in the following month, made a survey at the hill where a lot of rodent fossil was collected. The rodent fossil was taken as chicken bones by local people and the Chicken-bone Hill was so named. The latter is nominated later as Locality 6 of the Peking Man Site. This discovery of the locality is not so important, but the survey led to a series of investigations in the region.
Just after the discovery of the first skullcap of Peking Man, the second skullcap was discovered in the spring of 1930. It was found and restored from a block of sediments from locus nearby that of the first skullcap and brought back to the Cenozoic Research Laboratory.
In 1932, the scale of the excavation was large and daily employment of workers was more than one hundred. Within a square kilometre sphere, excavation of different loci was often carried out simultaneously.
Since 1935, excavation was under the charge of Mr. Jia Lan-po, world famous archeologist. In the following excavations, the most fruitful year was in 1936, three complete skullcaps were unearthed.
