Practical textbook for learning the structure and technology of boilers. - Title: Boiler Practical Textbook Second-Class Boiler Technician Textbook - Publisher: Japan Boiler Association - Contents: Practical textbook on boiler structure and technology - Cover Design: Orange cover with illustrations Set of two books. The Boiler Technician textbook is in excellent condition with no writing. The Second-Class Boiler Technician textbook has some highlighting and one instance of writing, but is in good condition. Thank you for looking.