T Thirteen Years at the Russian Court Pierre Gilliard Thirteen Years at the Russian Court Pierre Gilliard
G Galileo Galilei and the Roman Curia Karl von Gebler Galileo Galilei and the Roman Curia Karl von Gebler
L The Letters of S. Ambrose, Bishop of Milan Saint Ambrose The Letters of S. Ambrose, Bishop of Milan Saint Ambrose
O On the Philosophy of Discovery, Chapters Historical and Critical William Whewell On the Philosophy of Discovery, Chapters Historical and Critical William Whewell
F Frederick Chopin, as a Man and Musician Frederick Niecks Frederick Chopin, as a Man and Musician Frederick Niecks