If you need to find articles on a TOPIC or SUBJECT, use one of our databases. Databases collect article references from many sources so you can search broadly.
If you have a reference and you want to FIND AN EXACT ARTICLE, use the A-to-Z journal list. Search for the journal title and follow the links to the full text.
Alternately, you can use Google Scholar, which is pretty good at locating EXACT article titles.
GIS and computational tools like ArcGIS are best learned in a comprehensive manner during a for-credit course. But if you want to go it alone, or brush up, these are some good websites.