Bulletin of the Park Ridge Center, 1988, V3 N1, January/February

Bulletin of the Park Ridge Center, 1988, V3 N2, March/April

Bulletin of the Park Ridge Center, 1988, V3 N3, May/June

Bulletin of the Park Ridge Center, 1988, V3 N4, July/August

Bulletin of the Park Ridge Center, 1988, V3 N5, September/October

Bulletin of the Park Ridge Center, 1988, V3 N6, November/December

Bulletin of the Park Ridge Center, 1989, V4 N1, January

Bulletin of the Park Ridge Center, 1989, V4 N2, May

Bulletin of the Park Ridge Center, 1989, V4 N3, September

Bulletin of the Park Ridge Center, 1990, V5 N1, January

Bulletin of the Park Ridge Center, 1990, V5 N2, May

Bulletin of the Park Ridge Center, 1990, V5 N3, September