《水经注·卷十一》
徐水又流经北平县，县界有界碑，是汉息平四年所立。幽、冀二州遵照戊子日颁发的诏书，派了冀州从事王球、幽州从事张昭，去解决郡县分境的争端，于是立碑标界，将此事刻子碑上。
徐水又径北平县，县界有汉熹平四年幽、冀二州以戊子诏书，遣冀州从事王球，幽州从事张昭，郡县分境，立石标界，具揭石文矣。
The Xushui River flows past Beiping County, and there is a boundary marker at the county line, erected in the 4th year of Emperor Xiping. The Yanzhou and Jizhou regions followed the imperial edict issued on the day of the wuzi and sent Wang Qiu, a servant from Jizhou, and Zhang Zhao, a servant from Yanzhou, to resolve a boundary dispute between the two counties, so they established a boundary marker and recorded the event on the stele.