《后汉书·列传·儒林列传上》
起先，光武迁都还洛阳，那些经牒、秘书用二千辆车子运载，自此以后，三倍于前。
初，光武迁还洛阳，其经牒秘书载之二千余两，自此以后，参倍于前。
At first, when Emperor Guangwu moved the capital back to Luoyang, he used two thousand carriages to transport the scriptures and memoranda, which tripled in number ever since then.