神秘131工程:60年代修建的防核地下指挥部 [Mysterious Project 131: An underground nuclear command headquarters constructed in the 1960s]. xjqmx.gov.cn (in Simplified Chinese). Archived from the original on 2011-07-07.
xjqmx.gov.cn
神秘131工程:60年代修建的防核地下指挥部 [Mysterious Project 131: An underground nuclear command headquarters constructed in the 1960s]. xjqmx.gov.cn (in Simplified Chinese). Archived from the original on 2011-07-07.
