Great Western Observer (GWO)
GWO is the publication of the Western Alliance Conferences (WAC), serving all four western region planetarium organizations:
PPA (Pacific Planetarium Association),
RMPA (Rocky Mountain Planetarium Association),
GPPA (Great Plains Planetarium Association) and
SWAP (Southwest Association of Planetariums).
PPA Conference Proceedings
There is also a PPA electronic mailing list moderated through Karl von Ahnen <email@example.com>.