Complete Ninja Collection by Stephen K Hayes - Ninjutsu - epub

This 2014 compendium includes a new forward by Stephen K Hayes and reprints the following six books:

The Ninja and Their Secret Fighting Art (1981), Charles E. Tuttle Co.
Ninja: Spirit of the Shadow Warrior (1980), Ohara Publications
Ninja vol. 2: Warrior Ways of Enlightenment (1981), Ohara Publications
Ninja vol. 3: Warrior Path of Togakure (1983), Ohara Publications
Ninja vol. 4: Legacy of the Night Warrior (1985), Ohara Publications
Ninja vol. 5: Lore of the Shinobi Warrior (1989), Ohara Publications