I have been asked a few times if the National Federation of State High School Associations (NFHS) baseball rulebook is available online. The answer is yes, but you must be a member of an NFHS Professional Association or state staff member in order to access it. As a HS umpire registered with my state's activities association I was able to register with the NFHS and log on. The link for the rulebook is:
The baseball casebook is also available online at the same site.