Acknowledgments

I thank John Spitzak and Frank Briggs for many helpful discussions. This work was supported in part by NSF Presidential Young Investigator award AST-9158096.

Briggs, F. H. 1990, AJ, 100, 999

Briggs, F. H., Sorar, E., Kraan-Korteweg, R. C., & van Driel, W. 1997, this volume

Fisher, J. R., & Tully, R. B. 1981, ApJ, 243, L23

Henning, P. A., 1992, ApJS, 78, 365

Impey, C. D., Bothun, G. D., & Malin, D. F. 1988, ApJ, 330, 634

Krumm, N., & Brosch, N. 1984, AJ, 89, 1461

Lin, H., Kirshner, R. P., Shectman, S. A., Landy, S. D., Oemler, A., Tucker, D. L., & Schechter, P. L. 1996, ApJ, 464, 60

Sandage, A., Tammann, T., & Yahil, A. 1979, ApJ, 232, 352

Schechter, P., 1976, ApJ, 203, 297

Schneider, S. E. 1996, The Minnesota Lectures on Extragalactic Neutral Hydrogen, ASP Conference Series 106, ed. Evan D. Skillman, p. 323

Shostak, G. S., 1977, AA, 54, 919

Sorar, E., 1994, Ph.D. Thesis, University of Pittsburgh

Spitzak, J. G., 1996, Ph.D. Thesis, University of Massachusetts

Staveley-Smith, L. 1997, this volume

Weinberg, D. H., Szomoru, A., Guhathakurta, P., & van Gorkom, J. H. 1991, ApJ, 372, L13

© Copyright Astronomical Society of Australia 1997