The latest news on this front comes from a really interesting article at Ballot Access News written by the widely-respected election expert and advocate for third party/independent ballot access Richard Winger:
The Federal Election Commission has just published “Combined Federal/State Disclosure and Election Directory 2019”, a free book that has contact information for election officials in all states. It can be ordered by phoning 800-424-9530. Press “2”. This is the first version since the 2017 version, which had 142 pages.