It's not "Bills of Lading" which would imply Multiple receipts for One shipment. It is "Bill of Lading": a document that is tendured to the carrier as a receipt for a shipment which must contain within it the following:
Shipper's Address
Consignee's address
A shipper's reference number
Description of the Articles
which must be presented in tabular form
and contain the following:
Number of each differring Article per line
Hazardous Materials boolean flag
brief description of the Article
subtotal of the weight for that line of Articles
Applicable class or rate for those Articles
Total weight of the shimpent
Other things that can be found on a bill of lading are the following:
COD information
Freight charges Prepaid/Collect field
Section 7
terms and conditions.
consignee's purchase Order number (PO No.)