I have seen a proof that concludes this:
$\iiint_{V} \nabla \times \mathbf{B} \, dV = \iint_{S} \mathbf{n} \times \mathbf{B}\,dS$
My question is: if is it possible to take the volume integral of a vector field? Because $\nabla \times \mathbf{B}$ is
link of the book (pg 121): http://www.uop.edu.pk/ocontents/Vector%20Analysis%20Schaum.pdf