Use the CRAAP Test
Currency - Is it timely?
Relevance - Useful for your purposes?
Authority - Who? What is the source?
Accuracy - References to back it up?
Purpose - Why? Is there a bias?
Human Geography Subject Databases
The Sanborn Map Company published fire insurance maps for a century, repeatedly mapping U.S. towns and cities as they changed over time. These maps provide information such as building outline, size and shape, windows and doors, street and sidewalk widths, boundaries, and property numbers. Plans often include details on construction materials and building use, and also depict pipelines, railroads, wells, water mains, dumps, and other features.
Interdisciplinary Databases