《明史·志·卷六十八》
嘉靖元年，陕西苑骂少卿卢璧备文陈述养马政务，请求督促拖欠、严明印烙、规范医药、协调各地差异来缓解目前的情况，而开辟草场扩大畜养作为长久之计。
嘉靖元年，陕西苑马少卿卢璧条上马政，请督逋负、明印烙、训医药、均地差，以救目前，而辟场广蓄为经久计。
In the first year of the Jiajing era, Lu Bi, Deputy Gentleman-in-Waiting of the Shaanxi Imperial Stud, formally presented a document setting out horsebreeding policy, requesting that the collection of arrears be supervised, that branding be strictly enforced, that veterinary care be standardized and that regional variations be harmonized in order to alleviate the existing situation, while developing grasslands and expanding herds as a long-term strategy.