http://book.klll.cc/ebooks/subject/33558.opds 2025-08-03T22:44:51Z Books about Harvard College Observatory (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 2025-08-03T22:44:51Z https://book.klll.cc/ebooks/59633.opds History of the Harvard College Observatory During the Period 1840-1890 Daniel W. Baker