DLG stands for Digital Library of Georgia, an online repository of digitized books, manuscripts, photographs, government documents, newspapers, maps, audio, video, and other resources. Clicking on the "View DLG Record" link will take you to the record for the item in the Digital Library of Georgia. Look for an option that says "Click here to view this item." Clicking on the second link should take you to the item. Keep in mind that DLG items may not be text based and could include photos, maps, audio, video, etc.
