ea982cb8__Reference___Tech_Center___NPR__FIELD_DESCRIPTION
[FIELD NAME] audio.format.mp3 [SUB-ELEMENTS AND PARAMETERS] rights : Defines the delivery method for the MP3 files. [FIELD DESCRIPTION] 
The URL for the audio assets, in an MP3 format, that are available for the returned story.
API Output Reference : Tech Center : NPR
FIELD DESCRIPTION