Water thunders over the broad crest of the Great Dam at Lawrence, Massachusetts in this moody 1908 divided-back postcard — the Merrimack River's power harnessed here since 1848 to feed the textile mills that made Lawrence a world capital of worsted wool. The dam, stretching nearly 900 feet across, creates a curtain of white water that fills the foreground dramatically, while mill buildings and smokestacks crowd the far bank in soft halftone gray. The sender — writing to a "Mrs. Reuben" in Rochdale — shares a small-town note of mortality: "I heard Sadie King had died — did you hear it too yourself?" A vivid reminder that postcards were the social media of the Edwardian era, conveying gossip, condolence, and connection across miles for a single penny. Postmarked Lawrence, Mass., December 2, 5:30 PM, 1908, with a 1¢ Franklin green stamp cleanly cancelled.