What copyright restrictions are there on quoting from (or attaching PDF or similar copies of) old books, e.g., A Genealogy of the Descendants of Alexander Alvord (1908), or the Vermont Historical Gazetteer, in online message board messages or online family trees? Is one free to do so after a certain number of years have gone by since the publication? Is one limited to quoting a limited amount from the book? If so, what would be the limit? Is there a legal difference between indicating that Example Alvord was born anytime in anywhere, USA, and quoting from a book that states: "#555,555. EXAMPLE ALVORD (Father, Grandfather), born anywhere, USA, anytime"?