This question has already an accepted answer and it was long inactive: nevertheless I find compelling to say what I just found by googling the internet. It seems that recently the IAS has started a Digital Repository: it is called Albert, and between the other notes available as -pdf scans, they made available Almgren's ones: a direct link is given below in the "Reference" section, so every researcher seeking an answer to the above or any other related question will benefit from them.
Reference
[1] Frederick J. Almgren, “The Theory of Varifolds : A Variational Calculus in the Large for the $k$-Dimensional Area Integrand.” Institute for Advanced Study, -1, 1964.