The Scientific Papers of J. Willard Gibbs is available at Google books
(A 1906 Longmans, Green and Co. edition–London, New York and Bombay are the three cities listed for the publisher). My attempts to read Gibbs in the past have not been very successful; but, that is not going to stop me from dipping into a page or two once in a while. Of course, what I would love the most is an annotated Gibbs–till then, we will do with what we have!