Different Types of Magic Rectangles in Construction of Magic Squares of Order 30

This work brings magic squares of order 30. These are constructed based on different types of  magic rectangles.  These types are bordered, double digits and cornered magic rectangles. For more details on these types of magic rectangles refer author's work. The construction of magic squares is based on four equal sums magic rectangles of orders 12x18,  10x20, 8x22, 6x24  and 4x26. In case of cornered magic rectangles, three different types are magic squares are studies.