If you are choosing a PDF to download, you might see these two titles often. Here is the difference:

and has seen multiple iterations, notably the 2001 British edition and the 2008 second edition. Target Audience: Students at Pre-intermediate to Intermediate Vocabulary Scope: Approximately 38,000 words, phrases, and examples Typically 722 to 792 pages depending on the edition. Core Lexicon: Focuses on a 2,000-word defining vocabulary

If you tell me what you're looking for, I can help you find more information: (e.g., IELTS or TOEFL focus) Specific vocabulary levels (e.g., beginner vs. advanced)

For those using the digital version or "Memory Coach" CD-ROM (often bundled or available via specific portals): Active Practice