Thanks, Pangolin! I'm glad it worked for you.
The lrf format is for the Sony. It can be dragged and dropped into the Sony, put on through Calibre, and put on the Reader through the Sony library.
Have you checked all the free ebooks right here on MR? So many of those PD (and some CC) books are here and have been beautifully formatted for our Readers by some dedicated MR members.
For example....(4 novels and 56 short stories) in one download
HarryT's (MR member)
Conan Doyle, Sir Arthur: Complete Sherlock Holmes (Omnibus) lrf version
and the
ePub version of Harry T's Omnibus uploaded by (MR member) mtravellerh