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Recycle Symbol Meanings: How to Read Plastic Recycling Codes
Your Guide to Plastic Recycling Symbols - Acme Plastics
Recycling symbol - Wikipedia
Complete Guide to Reading Recycling Symbols | RTS
Recycling Symbols, Decoded - Real Simple
Recycling Symbols and What They Mean - GraingerKnowHow
A Look at the History of the Universal Recycling Symbol