A Log book is not required at Salem HS Fair. It is, however, a good way to keep up with your research and can be placed on the table in front of your project during judging. Log books can be made or you may purchase a composition book.
http://www.sciencebuddies.org/science-fair-projects/printable_project_logbook.pdf
http://www.sciencebuddies.org/science-fair-projects/printable_project_logbook.pdf