David Rector's thesis ("An Unstable Adams Spectral Sequence", MIT 1966) is 9 pages, according to the [record at the MIT library](http://library.mit.edu/item/000612341).  I haven't seen the actual thesis for many years, but I'm pretty the actual mathematical content takes about 3 pages total, and is largely identical to the published version in *Topology* (1966, same title), which is 3 pages plus bibliography.  (Dan Kan, his advisor, likes *short* papers.)