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](https://albert.ias.edu/home), 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](https://hdl.handle.net/20.500.12111/8025).” Institute for Advanced Study, -1, 1964.