CCI ARCHIVES / SCIENCE PHOTO LIBRARY CCI ARCHIVES / SCIENCE PHOTO LIBRARY
Collecting maple tree sap. Historical artwork of workers collecting the sap from sugar maple trees (Acer saccharum). After collection the sap is boiled to concentrate its sugar content, forming maple syrup. Engraving from "Grands Hommes et Grands Faits de l'Industrie" (1880).
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