You may select only one Source file at a time for searching. Source desciptions are available if you scroll down the page. These should be checked so that searches are done in the best Source materials most approriate for your research. Search terms are entered in the Topic box which is a required field. You can combine synonyms or related concepts with OR .
All available dates is the most comprehensive.
Note that most publications do not have coverage earlier than the early 1980's. To search a specific date or range of specific dates, select the custom date section by clicking in the circle. Then enter your dates in the boxes. Most ways of expressing dates are supported. See the provided examples for details.