Old Test. or O. T.—Old Testament.
Olym.—Olympiad.
Opt.—Optics.
Or.—Oregon.
Orig.—Originally.
Ornith.—Ornithology.
O. K.—All correct, (slang.)
The American Printer: A Manual of Typography Containing practical directions for managing all departments of a printing office, as well as complete instructions for apprentices; with several useful tables, numerous schemes for imposing forms in every variety, hints to authors, etc. · 第 396 / 417 题