One must be truly enamored of the internet that it allows one to find and read a copy of Bernhard Riemann’s ~~doctoral thesis~~ Habilitation Lecture (in English translation) at the University of Göttingen from 1854!

His brief paper has created a tsunami of mathematical work and research in the ensuing 156 years. It has ultimately become one of the seminal works in the development of the algebra and calculus of n-dimensional manifolds.

This wasn’t his doctoral thesis. That was on Riemann surfaces done in 1851. This is a lecture he gave to be a lecturer. It was one of 3 he had prepared from which Gauss has to pick one and he picked this one.

Yes, thanks James, my original source was confused. Here’s some of the further details:

–via Riemann biography http://www-groups.dcs.st-and.ac.uk/~history/Biographies/Riemann.html