I am very thankful to Ellen Bouton (National Radio Astronomy Observatory, Charlottesville), Marlene Cummins (University of Toronto Astronomy Library, Toronto), and Sarah Stevens-Rayburn (Space Telescope Science Institute, Baltimore) who provided a world of help through thoughtful comments and suggestions, as well as through careful proofreading (that was how I learned that the four of us can be called ``fuss-buckets''). Special thanks go to Carolina Noreña Janssen (Museo de Ciencias Naturales, Madrid) for extensive discussions and helpful comments.