http://book.klll.cc/ebooks/subject/29669.opds?sort_order=title 2025-11-15T14:03:13Z Books about Periodic law Free eBooks since 1971. Project Gutenberg https://book.klll.cc webmaster@gutenberg.org https://book.klll.cc/gutenberg/favicon.ico 25 1 2025-11-15T14:03:13Z https://book.klll.cc/ebooks/51326.opds Principles of Chemistry, Volume I Dmitry Ivanovich Mendeleyev 2025-11-15T14:03:13Z https://book.klll.cc/ebooks/54210.opds Principles of Chemistry, Volume II Dmitry Ivanovich Mendeleyev