Interval
Over the years, Interval: the Journal of Music Research and Development has had a number of articles about 19-tet scales, instruments, and theory. Some of these are:
Prelude No. 1 for Guitar: Original Version in 19-Tone system (score)
by Ivor Darreg
Modifying a Trumpet to Play 19 Tone Music
by G. W. Swift and M. Yunik
Advantages and Disadvantages of 19-Equal
Ivor Darreg