Ordinarily four documents, known as the "commercial set", represent and serve as a substitute for the goods constituting a shipment in international trade. These documents are the invoice ("the merchant's bill for the goods"), the draft or bill of exchange ("the merchant's payment for the goods"), the bill of lading ("the carrier's receipt for the goods" and "the contract of carriage"), and the marine insurance certificate ("the document of guaranty").
Huebner, Solomon S. PhD, "The Brussels Rules as Viewed by Marine Underwriters" (1967). Solomon S. Huebner Documents. 138.