If you search for the "Oxford Advanced Learner's Dictionary 3rd edition" today, you will find fierce bidding wars on eBay and AbeBooks. Why? Because subsequent editions (4th, 5th, 9th, etc.) took a different path. Here is what the 3rd edition offers that modern dictionaries do not.
The classic learner’s companion that set a new standard for ESL/EFL reference oxford advanced learner 39-s dictionary 3rd edition