Section 47, The Customs Regu- Citation

The entries required to be made for imported goodsother than goods in transit or for transhipment shall be in one of the forms C 11 to C 15 as follows and shall be submitted in triplicatea 11, entry ex-ship for goods free of duty, or C 12, entry ex-ship for goods liable to specific duty, or C 13, entry ex-ship for goods liable to ad valorem duty, or C 14, entry ex-ship provisional, or C 15, entry for warehousing.