Don't forget to look in the general and business news sections to learn about companies that are setting up or growing as a source of new vacancies. Larger news agencies carry a variety of such publications. Employment agencies fill jobs on behalf of their clients. There is a large number of agencies listed in the Yellow Pages, if you approach them unsolicited, check to see if they deal with the specific type of employment you are seeking. Some good advice on dealing with employment agencies is shown below in our links section.
Many jobs go unadvertised.
Consider approaching contacts you have made in previous employment situations if you have been in the workforce for some time, or associates within clubs or associations you are involved with. If not for direct employment opportunities, at least for ideas on where to look or who might be employing. Who's Who and Jobson's Book of Public Companies. The key here is persistence. The more realistic alternatives you can source and follow, the more options you will have to select from later.