Savvas Learning
Prentice Hall: Proofreader's Marks
One of the more complete lists of proofreader's marks. Includes meanings and examples of their use. Divides marks into seven categories: style of type, position, spacing, insertion and deletion, paragraphing, punctuation, and...
Other
Eei Communictions: Standard Proofreading Marks
This resource presents a table of standard proofreading marks. The table indicates whether the marks would be used in the margin or in the text, but does not give examples of the marks in use.