In its classic sense, "classics", when used as a singular noun, means the study of the language, literature, history, art, and other aspects of ancient Greece and Rome. As a plural noun "classics" are books written in ancient Greece and Rome.
... with an inventory of 12,000 titles.
1904 in literature
1904 in music
1904 in sports
The second Summer Olympic Games are held in St. Louis, Missouri, ...