The UO Libraries subscribe to a number of databases that may be searched to find scholarly articles using a geographic approach. Each database uses a carefully constructed list of index terms. Once you find a good article on your topic, you can look at the index terms for that article and search for others in the same database using those index terms. Index terms give you the power of focused searching and eliminate some of the guesswork on what terms an author used (for example, geographical vs. geographic). Unfortunately the index terms are not identical for each database. To do a comprehensive literature search you will need to search each database individually.