Bladder cancer is any of several types of cancer arising from the tissues of the urinary bladder.
The Douglas B-23 Dragon is an American twin-engined bomber developed by the Douglas Aircraft Company as a successor to (and a refinement of) the Douglas B-18 Bolo.
A field gun is a field artillery piece.
Hours of Work and Rest Periods (Road Transport) Convention, 1939 (shelved) is an International Labour Organization Convention.
NGC 1097 is a barred spiral galaxy about 45 million light years away in the constellation Fornax.
The Ruy Lopez, also called the Spanish Opening or Spanish Game, is a chess opening characterised by the moves: The Ruy Lopez is named after 16th-century Spanish bishop Ruy López de Segura.