I’m using the Cambridge English Pronouncing Dictionary (18th edition, 2011). I know how IPA phonemes work and can also fathom American notations. So, which dictionary would best help a rookie to learn a contemporary American accent? Don’t suggest age-old dictionaries.
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None: you cannot pick up an accent from a dictionary. You can only pick up an accent from listening to it.
There’s far, far, far more to an accent than its phonology alone, let alone that part of its phonology readily expressible in IPA. Note also that most dictionaries at best use phonemic transcriptions, not phonetic ones. A phonemic transcription will not be enough to tell someone just learning the language how it is to be pronounced phonetically.
The Wikipedia article on accent points this out in the following citation:
Many adult and near-adult learners of second languages have unintelligible speech patterns that may interfere with their education, profession, and social interactions. Pronunciation in a second or foreign language involves more than the correct articulation of individual sounds. It involves producing a wide range of complex and subtle distinctions which relate sound to meaning at several levels.