The Official 2019 Rules Manuals are available for FREE from the National Science Olympiad store. Please follow the link, https://store.soinc.org/us/page/manuals, to download both Division B and Division C rules (in PDF format) . You will be required to enter your contact information, school/organization affiliation and agree to the Terms of Service.
Please note that over the course of the season, rule changes and clarifications may occur. These will be posted on the National Science Olympiad website at https://www.soinc.org/faqs-rules-changes. Be sure to check there frequently and before a tournament for the latest information. The site also contains an FAQ where you an view answers to Frequently Asked Questions, or ask your own questions!