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This book includes elastic and plastic buckling of spherical shells under various kinds of loading conditions. The first part of the book presents the analytical, numerical, and experimental results of moderately thick and thin hemispherical metal shells into the plastic buckling range illustrating the importance of geometry changes on the buckling load. In the second part of the book, the Southwells nondestructive method for columns is analytically extended to spherical shells subjected to uniform external pressure acting radially. Subsequently by finite element simulation and experimental work shown that the theory is applicable to spherical shells with an arbitrary axi-symmetrical loading too.