http://book.klll.cc/ebooks/subject/31922.opds 2025-11-18T09:24:16Z Books about Auroras Free eBooks since 1971. Project Gutenberg https://book.klll.cc webmaster@gutenberg.org https://book.klll.cc/gutenberg/favicon.ico 25 1 2025-11-18T09:24:16Z https://book.klll.cc/ebooks/56159.opds Auroræ: Their Characters and Spectra J. Rand Capron