http://book.klll.cc/ebooks/author/49078.opds?sort_order=downloads 2025-11-16T17:57:24Z Books by Judd, Charles Hubbard Free eBooks since 1971. Project Gutenberg https://book.klll.cc webmaster@gutenberg.org https://book.klll.cc/gutenberg/favicon.ico 25 1 2025-11-16T17:57:24Z https://en.wikipedia.org/wiki/Charles_Hubbard_Judd See also: en.wikipedia 2025-11-16T17:57:24Z https://book.klll.cc/ebooks/56903.opds Introduction to the scientific study of education Charles Hubbard Judd