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http://developer.mbed.org/users/mbed_official/code/mbed/ - SDK?
http://developer.mbed.org/users/mbed_official/code/mbed-src/ - manually synced to:
https://github.com/mbedmicro/mbed - seems like official repo
http://developer.mbed.org/handbook/mbed-library-internals
https://github.com/lcvisser/mbed-lib