Works on Australian, Canadian, New Zealand, and USA trade law are in the K section of monographs on Level 2.
Look for the third line of the shelf mark for the distinguishing jurisdictional cutters, respectively, A8, C1, N4, and U4.
Other jurisdictions have intuitive shelf marks - eg China 510 for monographs on Chinese trade law.
"The UCC is a comprehensive modernization of various statutes relating to commercial transactions including sales, leases, negotiable instruments, bank deposits and collections, funds transfers, letters of credit, bulk sales, documents of title, investment securities, and secured transactions.
The Permanent Editorial Board for the UCC, a joint committee of ALI and the Uniform Law Commission, assists in attaining and maintaining uniformity in state statutes governing commercial transactions by discouraging non-uniform amendments to the UCC by the states, and by approving and promulgating amendments to the UCC when necessary."