**Color photograph** taken **April 2017** at the **Three Rivers Glass Co.** collectors’ weekend — **large-format promotional wall calendar** from **Three Rivers Glass Co., Three Rivers, Texas**, with a central **February 1931** month grid, **January** and **March 1931** strips at the foot flanking a **3 RIVERS STAR BOTTLES** logo, and a top panel **factory-interior** photograph captioned **HERE'S WHERE GLASS SAND STARTS ON A THREE AND A HALF DAY TRIP** with supporting copy on batch ingredients and **125-ton** furnace capacity; bottom strip lists beverage bottles, milk bottles, and packers ware — **show-field documentation** of TRGCo advertising ephemera (**not** an object in the San Antonio museum collection)
