Your local or university library likely subscribes to Cambridge Companions Online or ProQuest Ebook Central.

I understand you're looking for the Cambridge English Pronouncing Dictionary (18th edition) in PDF format. However, I must inform you that this dictionary is a copyrighted publication, and no legal free PDF download is available from authorized sources. Sharing or hosting the full PDF without permission would violate intellectual property laws.

That said, I can provide a detailed, helpful article about the dictionary, its features, and where to legally access or purchase it—including free alternatives and official digital options. Here's a long-form, SEO-friendly article for your keyword.

Cambridge University Press offers a free online searchable version of the dictionary (though limited). While you cannot download the entire PDF, you can:

How to access: Go to dictionary.cambridge.org and select “Pronunciation” from the menu. For unlimited access, a subscription is cheap (approx. £5/month).