CBLE References: Which HTSUS and 19 CFR Editions, and How to Tab Them

For the October 28, 2026 exam, CBP lists five references (CBLE Registration Information, last modified June 15, 2026, checked 12 Oct 2026). CBP loads electronic copies into the exam software, but recommends bringing paper copies as a backup.

The references

For an April exam CBP usually names the previous year's HTSUS Basic Edition; for an October exam, the current year's. The CFR edition is one to two years old, depending on when the printed volumes are available. Check CBP's registration page for your sitting.

What you may bring

• Paper references and any other paper materials, in one rolling crate or one suitcase no larger than 16" H x 18.5" W x 15" D, plus a shelf or rack up to 42" high.
• Paper and writing utensils, an analog watch and small plastic sand timers.
• Your ID and proof of US citizenship (a US passport covers both).
• No electronic devices of any kind: no phones, smart watches, tablets or digital timers.

Searching the electronic references

Press Ctrl+F to search inside a reference. You must type the terms; copying from a question is blocked. The search highlights matches but does not jump between them, so scroll. Close the search box when you switch documents.

Tabbing paper copies

• 19 CFR: tab Parts 24, 101, 111, 113, 133, 134, 141, 142, 152, 159, 162, 163, 171, 174, 190.
• HTSUS: tab the General Rules, General Notes 3, 4 and 11, each section's first page, and Chapters 39, 61-64, 84, 85, 94 and 98-99.
• Mark the definitions in 19 CFR 101.1 and 111.1: "business day", "working day", "customs business", "processing Center".