This 1975 issue of Physics Today covers a range of interesting topics, including energy efficiency, continental drilling, and magnetic fields. It provides a fascinating insight into the scientific developments of the time, with articles written by leading experts in their fields. Whether you're a collector of vintage magazines or simply interested in the history of science, this publication is sure to captivate you. Within its pages, you'll find discussions on the latest research and theories, as well as informative features on the practical applications of physics. From the exploration of natural resources to the creation of new technologies, Physics Today 1975 offers a glimpse into the scientific landscape of the past. This is a must-have item for anyone with an interest in the history of science and technology.