When Worlds Collide and After Worlds Collide: 2 Big Volumes in 1

Hardcover book containing two volumes of work. No indication of edition or publication date; the only dates are the original copyright dates of 1932 & 1933 respectively. The front cover states "Two great imaginative novels of the atomic age now combined in this one thrilling book." When Worlds Collide is about two renegade planets hurtling towards Planet Earth and the approaching possibility of complete annihilation. After Worlds Collide is about the few survivors, how they managed to find safe haven on a planet beyond the sun, and they struggles they endured.