http://book.klll.cc/ebooks/subject/36930.opds 2025-08-06T15:03:04Z Books about Research (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 2025-08-06T15:03:04Z https://book.klll.cc/ebooks/66373.opds Reglas y consejos sobre investigación científica (Spanish) Santiago Ramón y Cajal