Nong zheng quan shu. 15 (農政全書. 15)

Xu, Guangqi, 1562-1633 (徐光啟, 1562-1633)

Nong zheng quan shu. 20 (農政全書. 20)

Xu, Guangqi, 1562-1633 (徐光啟, 1562-1633)