The first edition of Hazardous Trees: A Pictorial Library is an overview of basic tree biology in relation to wood strength and weaknesses. The photographic technology of today serves as an excellent opportunity to highlight a wide range of tree structural weaknesses as they relate to potentially hazardous conditions to things in proximity. Proper tree assessment and maintenance techniques addressing these potential weaknesses will be highlighted. Specific hazard tree assessments, the author's general hazard assessment for a wide range of tree species and establishing a monetary value to specific trees, whether historical in nature or standing naturally in a forest stand, will be highlighted.