BIOETHICSLINE was a bibliographic database that existed to index the bioethics literature from 1973 until 2000, hosted by the National Library of Medicine. In 2000, the records indexed in this database were integrated into other NLM products; PubMed now includes the journal and newspaper articles as well as court decisions, while LocatorPlus includes books, book chapters, legislative bills, and unpublished documents.
This is a catalog of the NLM holdings, so if you find a book you are interested in, you can go to the record and click on "Find Other Libraries That Own This", which will search WorldCat so you can see what libraries near you own the book.
In PubMed you can restrict your searches to a subset of journals that are important for bioethics.
If you are searching MEDLINE through the Ovid interface, you can also limit the search to bioethics journals, just check the box next to "Subset Bioethics".