Library of Congress National Audio-Visual Conservation Center
Now See Hear showcases collections, announces new acquisitions and projects, publicizes public programs, provides information about the Film and Sound Recording Registries, and discusses the procedures and technology being used to describe, preserve, and make accessible our audiovisual heritage.
http://blogs.loc.gov/now-see-hear
Preserving Audio Cylinders:
http://blogs.loc.gov/now-see-hear/2015/10/preserving-audio-cylinders-from-edison-to-the-archeophone/