Vintage tunnel illustration https://www.rawpixel.com/image/451704/premium-illustration-vector-vintage-workers-air-flue-antiqueView license[Untitled photo, possibly related to: Abandoned coal mine, Garrett County, Maryland]. Sourced from the Library of Congress. https://www.rawpixel.com/image/12253616/photo-image-plant-forest-treeFree Image from public domain licenseShenandoah, Pennsylvania. A car (elevator) at the bottom of a shaft seven hundred feet below the surface at Maple Hill mine.… https://www.rawpixel.com/image/12275526/photo-image-person-wood-public-domainFree Image from public domain licenseSan Bernardino, California. A tunnel at the ice plant through which air is blown on its way to the refrigerator cars.… https://www.rawpixel.com/image/12292323/photo-image-plant-road-public-domainFree Image from public domain licenseVintage tunnel illustration https://www.rawpixel.com/image/451707/premium-illustration-vector-vintage-car-air-flue-antiqueView licensePittsburgh, Pennsylvania (vicinity). Montour no. 4 mine of the Pittsburgh Coal Company. Mine car operating off a trolley… https://www.rawpixel.com/image/12289972/photo-image-person-public-domain-manFree Image from public domain licensePittsburgh, Pennsylvania (vicinity). Montour no. 4 mine of the Pittsburgh Coal Company. Electric mine engine. Sourced from… https://www.rawpixel.com/image/12289940/photo-image-person-public-domain-manFree Image from public domain licenseReligious sign in Rochester, Pennsylvania. Sourced from the Library of Congress. https://www.rawpixel.com/image/12278912/photo-image-person-public-domain-architectureFree Image from public domain licenseSyracuse (vicinity), Sicily. Family in catacombs where more than 2,000 refugees were housed during the war. Sourced from the… https://www.rawpixel.com/image/12296516/photo-image-person-public-domain-familyFree Image from public domain licenseStructure of covered bridge. Wallingford, Vermont. Sourced from the Library of Congress. https://www.rawpixel.com/image/12269379/photo-image-wood-public-domain-archFree Image from public domain licenseTrampas, Taos County, New Mexico. A deserted adobe in a Spanish-American village in the foothills of the Sangre de Cristo… https://www.rawpixel.com/image/12291587/photo-image-pattern-road-mountainsFree Image from public domain licenseAbandoned coal mine. Garrett County, Maryland. Sourced from the Library of Congress. https://www.rawpixel.com/image/12274730/photo-image-public-domain-nature-iceFree Image from public domain licensePittsburgh, Pennsylvania (vicinity). Montour no. 4 mine of the Pittsburgh Coal Company. Mine car operation off cable in… https://www.rawpixel.com/image/12289998/photo-image-person-technology-public-domainFree Image from public domain licenseA coal mine in southern Iowa. Near Ottumwa, off U.S. Highway No. 34. Sourced from the Library of Congress. https://www.rawpixel.com/image/12267659/photo-image-public-domain-nature-soilFree Image from public domain licenseMechanical cutting machine that increases coal production. Old Ben number eight mine. West Frankfort, Illinois (see 26980… https://www.rawpixel.com/image/12272941/photo-image-person-public-domain-natureFree Image from public domain licenseUnder-cutting machine. Old Ben number eight. West Frankfort, Illinois (see 26980-D). Sourced from the Library of Congress. https://www.rawpixel.com/image/12272736/photo-image-person-public-domain-manFree Image from public domain licensePit car loader, one of the early types of mechanical loaders. Old Ben number eight. West Frankfort, Illnois (see 26980-D).… https://www.rawpixel.com/image/12274197/photo-image-person-public-domain-manFree Image from public domain licenseShenandoah (vicinity), Pennsylvania. A compressed air engine approaching with a train of cars in the Maple Hill mine. The… https://www.rawpixel.com/image/12275710/photo-image-public-domain-hill-architectureFree Image from public domain licenseVintage tunnel illustration https://www.rawpixel.com/image/451709/premium-illustration-vector-train-vintage-air-flue-antiqueView licenseCarthage, Tunisia. American Army chaplains inspecting the ruins of the Roman arena where Christian martyrs were thrown to… https://www.rawpixel.com/image/12295242/photo-image-person-public-domain-manFree Image from public domain licenseShenandoah (vicinity), Pennsylvania. Timbers in tunnel 29 of the Maple Hill mine, at the end where they are leaving the… https://www.rawpixel.com/image/12275528/photo-image-background-pattern-woodFree Image from public domain licenseOld abandoned coke ovens with mine tipple in background, Maitland, West Virginia. Sourced from the Library of Congress. https://www.rawpixel.com/image/12247941/photo-image-background-plant-skyFree Image from public domain license