While there's sufficient information in the net and elsewhere to light up Nixies and make them work (see my Nixie datasheets) but as far as subtleties go (off-cathode leakage, ionization time vs. multiplexing, the reason for the funny digit stacking order) there's little out there.
But here are a few useful Burroughs Application Notes. If you are trying to work with Nixies read N101 and N102, as even the multiplexing Note contains useful data for non-multiplexed apps.
These were all authored by A. Somlyody, Manager, Applications Engineering, Burroughs Corp, in the late 1960's.
