How do I know if the library has a specific article I need?

From Guides

To see if an article is available electronically, click on E-Journals on the library webpage and type the title of the journal, magazine, or newspaper where your article is published. If it’s not available electronically, type the title of the journal, magazine, or newspaper in the ALADIN Catalog Quick Search to find a print or microfilm copy. See DoItYourself@Gelmanfor full instructions.