http://book.klll.cc/ebooks/subject/19150.opds 2025-09-01T10:30:43Z Books about Bubbles (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 2025-09-01T10:30:43Z https://book.klll.cc/ebooks/33370.opds Soap-Bubbles and the Forces Which Mould Them C. V. Boys