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APA Citation Edition CitationRiley, D. (1980). Early landscape from the air. Studies of crop marks in South Yorkshire and North Nottinghamshire. [s.n.].
Chicago Citation Edition CitationRiley, D. Early Landscape from the Air. Studies of Crop Marks in South Yorkshire and North Nottinghamshire. Sheffield: [s.n.], 1980.
MLA Citation Edition CitationRiley, D. Early Landscape from the Air. Studies of Crop Marks in South Yorkshire and North Nottinghamshire. [s.n.], 1980.