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马铺第六十三
每铺相去三十里，于要路山谷间牧马两匹，设游奕计会。有事警急，烟尘入境，即报探。设土河于山谷口，当贼路横断，阔二丈，深二尺，以细沙土填平。每日检行迹，扫令净平。人马入境，即知足迹多少。
虎钤经 · 许洞 · Chapter 70 of 218
马铺第六十三
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