Map of the United States : exhibiting the post-roads, the situations, connexions & distances of the post-offices, stage… https://www.rawpixel.com/image/7667116/image-art-vintage-public-domainFree Image from public domain license Geological map of Indiana, showing location of stone quarries and natural gas and oil areas https://www.rawpixel.com/image/8908139/image-vintage-public-domain-mapFree Image from public domain license