Dinerstein, Harriet L. (Harriet Lenore)2010-06-042017-05-112010-06-042017-05-112009-08August 200http://hdl.handle.net/2152/ETD-UT-2009-08-386textapplication/pdfengCopyright is held by the author. Presentation of this material on the Libraries' web site by University Libraries, The University of Texas at Austin was made possible under a limited license grant from the author who has retained all copyrights in the works.ISMabundancesplanetary nebulaeNGC 7009thesis