The chess Euclid : a collection of two hundred chess problems and end-games (1849)
Kling, Joseph, 1811-1876, author, H. Hurst and Co., publisher, Westleys & Co., binder · London : H. Hurst and Co., 27, King William Street, Charing Cross · leaf 124
CCIX. White forces Black to mate in seven moves. White. g; OCX.
Chess problems · Chess
Internet Archive · Harold B. Lee Library · Public domain (published before 1931). Free to use for anything.