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^ 7.07.1Graunt, John; Petty, William, Natural and political observations mentioned in a following index, and made upon the bills of mortality [microform] / by John Graunt ...; with reference to the government, religion, trade, growth, ayre, diseases, and the several changes of the said city, Printed by Tho. Roycroft for John Martin, James Allestry, and Tho. Dicas, 1662 (英语)引用错误:带有name属性“:1”的<ref>标签用不同内容定义了多次
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^John Sartain (1820). Annals of the fine arts. London, Sherwood, Neely, and Jones, digitised by Moore College of Art, Philadelphia, p.80
^"He shewes that 't is the seacoale smoake
That allways London doth Inviron,
Which doth our Lungs and Spiritts choake,
Our hanging spoyle, and rust our Iron.
Lett none att Fumifuge be scoffing
Who heard att Church our Sundaye's Coughing."
from; "Ballad of Gresham College". Original text.
^"Counting the Cost of London's Killer Smog" Richard Stone Science 13 December 2002: Vol. 298, Issue 5601, pp. 2106-2107 DOI: 10.1126/science.298.5601.2106b