Lesley, J. P. (1874). A collection of occasional surveys of iron, coal and oil districts in the United States: Made during the last ten years. McCalla & Stavely.
Lua i Stíl Chicago (17ú heag.)Lesley, J. P. A Collection of Occasional Surveys of Iron, Coal and Oil Districts in the United States: Made During the Last Ten Years. Philadelphia: McCalla & Stavely, 1874.
Lua MLA (8ú heag.)Lesley, J. P. A Collection of Occasional Surveys of Iron, Coal and Oil Districts in the United States: Made During the Last Ten Years. McCalla & Stavely, 1874.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.