http://book.klll.cc/ebooks/author/9590.opds 2025-11-14T15:18:56Z Books by Davis, Calvin Olin Free eBooks since 1971. Project Gutenberg https://book.klll.cc webmaster@gutenberg.org https://book.klll.cc/gutenberg/favicon.ico 25 1 2025-11-14T15:18:56Z https://book.klll.cc/ebooks/20893.opds A Guide to Methods and Observation in History Calvin Olin Davis