Photograph of construction of beach groins which keep water from eroding from the coast, 1953. One man in dark work clothes and thick gloves sits at the driver's seat on the left of a tank-like machine which reaches an appendage into the crater of sand at center. Three men work at the end of the appendage where three slaps of concrete are leaned against each other forming the beginnings of a beach groin. A fourth man can be seen on the right kneeling above the crater with trees standing in the background. Photoprint reads "With the aid of a mechanical shovel, engineers set huge blocks of concrete in a southern California beach. Thousands of such blocks make up the groins which build up the nation's beaches".