http://book.klll.cc/ebooks/subject/37817.opds 2025-08-21T08:53:29Z Books about Plastics (sorted by popularity) Free eBooks since 1971. Project Gutenberg https://book.klll.cc webmaster@gutenberg.org https://book.klll.cc/gutenberg/favicon.ico 25 1 2025-08-21T08:53:29Z https://book.klll.cc/ebooks/68224.opds Synthetic resins and their raw materials United States Tariff Commission