16 A series of books and written articles in the field of medical treatment and disability duration guidelines; A series of books, written articles, handouts and worksheets in the field of workers compensation, medical treatment and disability duration guidelines; Books in the field of medical treatment and disability duration guidelines; Printed certificates; Printed educational materials in the field of workers compensation, medical treatment and disability duration guidelines; Printed materials, namely, written articles in the field of workers compensation, medical treatment and disability duration guidelines; Publications, namely, books and handouts in the fields of workers compensation, medical treatment and disability duration guidelines; Reference books in the field of medical treatment and disability duration guidelines; Research reports featuring studies on workers compensation, medical treatment and disability duration guidelines; Resource books in the field of medical treatment and disability duration guidelines; Series of non-fiction books in the field of medical treatment and disability duration guidelines