File:Observational-method.jpg

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The site of the collapsed Heathrow Express tunnel from 1994

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	Date/Time	Thumbnail	Dimensions	User	Comment
current	23:05, 13 September 2016		800 × 566 (69 KB)	Ppmex84 (talk \| contribs)	The site of the collapsed Heathrow Express tunnel from 1994

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Software used	Adobe Photoshop CS6 (Windows)