Offered by law schools, student organizations, professional associations, etc. Ask about them at Career Services. Identifying organizations see Resources for Locating Potential Employers by clicking here 2. Also requires targeted cover letters. Addresses and names can be obtained through Lexis, Westlaw, directories, membership lists, phone books, alumni directories, etc.
Thorough research is required.
Know a great deal about your field because they're in it or 2. Would have the power to hire you or could recommend you if they knew of an opening. Ask them for advice and for their biography. Let everyone you come in contact with know you are job hunting.