The pre-bebop styles of block-chord solos and solo guitar chord melody are almost completely lost arts. There are few living practitioners, and few resources to learn from. However, there is one book out there which is still in print that provides a great deal of insight, as well as a multitude of transcriptions:

Masters of the Plectrum Guitar (Mel Bay)

Transciptions of Eddie Lang, Carl Kress, Dick McDonough, George M. Smith, Carmen Mastren, and Tony Mattola, as well as couple duet pieces. Modern technology also provides you the opportunity to check out the book before you by it at Google Books.

Masters of the Plectrum Guitar (Google Books Preview)

I particularly suggest taking a look at the full transcription of "Sutton Mutton" by Carl Kress on pgs. 42-45. I still haven't gotten around to learning the slow section, but I love the first section, and it's often the first thing I play when testing out an acoustic archtop. Thanks to Mike Faltesek for bringing it to my attention.