http://book.klll.cc/ebooks/subject/39165.opds 2025-11-15T01:05:48Z Books about Abstraction Free eBooks since 1971. Project Gutenberg https://book.klll.cc webmaster@gutenberg.org https://book.klll.cc/gutenberg/favicon.ico 25 1 2025-11-15T01:05:48Z https://book.klll.cc/ebooks/70911.opds The evolution of general ideas Th. Ribot