For 10 points, identify this resource that people placed in namesake boxes to keep food fresh before refrigeration.
In 1900, Charles Morse unsuccessfully attempted to raise the price of this good after monopolizing it in New York City. In the 1900s and 1910s, American newspapers often ran sensational stories warning that warm winters would cause "famines" of this good. Frederic Tudor became known as the "king" of this resource by harvesting it in New England and shipping it to Europe and India. During the late 19th and early 20th centuries, American families would leave cards outside their windows showing the number of pounds of this resource they wanted, alerting workers who brought it door to door. Alaska was a major source of this resource, which was harvested from ponds and rivers. For 10 points, identify this resource that people placed in namesake boxes to keep food fresh before refrigeration.
In 1900, Charles Morse unsuccessfully attempted to raise the price of this good after monopolizing it in New York City.
ice [prompt on water] &lt;Magin&gt;