http://book.klll.cc/ebooks/subject/21474.opds?sort_order=release_date 2025-08-25T07:52:20Z Books about Operetta (sorted by release date) Free eBooks since 1971. Project Gutenberg https://book.klll.cc webmaster@gutenberg.org https://book.klll.cc/gutenberg/favicon.ico 25 1 2025-08-25T07:52:20Z https://book.klll.cc/ebooks/subject/21474.opds?sort_order=title Sort Alphabetically by Title 2025-08-25T07:52:20Z https://book.klll.cc/ebooks/subject/21474.opds?sort_order=downloads Sort by Popularity 2025-08-25T07:52:20Z https://book.klll.cc/ebooks/42918.opds The Standard Light Operas, Their Plots and Their Music George P. Upton 2025-08-25T07:52:20Z https://book.klll.cc/ebooks/36215.opds Famous Prima Donnas Lewis Clinton Strang