Subject headings: subject headings in ethics are extremely broad, but here are a few examples:

• Religious ethics (or Christian ethcs, Buddhist ethics, etc.)
• Environmental ethics
• Medical ethics
• Social ethics
• Religion and ethics -- History ;

You can instead try Keyword searching using the Topic Search option using keywords like "ethics," "ethical," "scruples," and "conscience."

Call number ranges: 
Ethics titles can be found in many LC call number ranges, but here are few specific ranges:

• BJ1012 - Ethics (as a general subject within Philosophy)
• HF5387 - Business Ethics
• TA157 - Engineering Ethics
• Q180.55 - Research ethics
• QH332 - Bioethics
• R724 - R726  - Medical Ethics