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In page Patch collecting:
"The production of stick-on souvenir badges seems to have started in mainland Europe during the early 20th-century, probably in Germany shortly after the First World War when hiking became popular, and people began sewing badges of resort towns onto their backpacks and jackets. In the U.S., the development of the National parks system and the growing popularity of vacationing saw a similar development of patch collecting.[citation needed]
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