Lichti, G

Strong, A

Collmar, W

Diehl, R

Much, R

Schöenfelder, V

Stinle, H

Varendorff, M

Bloeman, H

de Boer, H

den Herder, JW

Hermsen, W

Kuiper, L

Swanenburg, B

de Vries, C

Connors, A

Lockwood, J

Macri, J

McConnell, Mark

Morris, D

Ryan, J

Stacy, G

Webber, W

Bennett, K

Busetta, M

Winkler, C

September 1991

Bulletin of the American Astronomical Society  Journal