Cloning this repository:

git clone git://code.seas.harvard.edu/+cs61-staff/cs61/cs61-lectures-2014.git cs61-lectures-2014
cd cs61-lectures-2014

Add this repository as a remote to an existing local repository:

git remote add cs61-lectures-2014 git://code.seas.harvard.edu/+cs61-staff/cs61/cs61-lectures-2014.git
git fetch cs61-lectures-2014
git checkout -b my-local-tracking-branch cs61-lectures-2014/master_or_other_branch