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Mances field heliograph Stock Photos and Images
Illustration depicting Mance's field heliograph. Dated 19th Century Stock Photohttps://www.alamy.com/image-license-details/?v=1https://www.alamy.com/stock-photo-illustration-depicting-mances-field-heliograph-dated-19th-century-131278797.htmlRMHHG7CD–Illustration depicting Mance's field heliograph. Dated 19th Century
