http://book.klll.cc/ebooks/subject/34336.opds 2025-11-18T07:05:09Z Books about Sioux Falls Army Air Base (S.D.) Free eBooks since 1971. Project Gutenberg https://book.klll.cc webmaster@gutenberg.org https://book.klll.cc/gutenberg/favicon.ico 25 1 2025-11-18T07:05:09Z https://book.klll.cc/ebooks/61030.opds Technical School, Sioux Falls Army Air Field Northwestern Bell Telephone Company