Finding Def-Stan/Mil-Spec documents

Hello, 

        I am an Aerospace Engineering student in the UK, looking for
either Def-Stan or Mil-Spec requirements for aircraft Propellers on
the internet.

Does anyone know of a website where I can find any of these documents?
As I've been searching for a while now and cant find a site where
there is a complete list.

I'd be really grateful for any help.

Thanks, David Baddeley