Hi, Can anyone please suggest me some of the best books and video tutorials for the below subjects? 1. Strength of materials/ Mechanics of materials 2. Mathematics- Calculus, differential equations 3. Books on how to find centroids, center of gravity and basicly pre requisye knowledge to strength of materials 4. Composites- material science and design of structures 5. Non destructive testing 6. Finite element method/ analysis Thanks!