http://book.klll.cc/ebooks/author/42264.opds?sort_order=title 2025-11-16T06:33:56Z Books by United States. Army. Signal Corps Free eBooks since 1971. Project Gutenberg https://book.klll.cc webmaster@gutenberg.org https://book.klll.cc/gutenberg/favicon.ico 25 1 2025-11-16T06:33:56Z https://book.klll.cc/ebooks/55084.opds Homing Pigeon United States. War Department and United States. Army. Signal Corps 2025-11-16T06:33:56Z https://book.klll.cc/ebooks/43515.opds Visual Signaling United States. Army. Signal Corps