Ice harvesting is a good story to study , i read there were 30,000 men in Maine alone who harvested ice all winter and saved it until the next winter, even shipping it as far away as New Zealand of all places, read it in a book about gold finds , apparently a New Zealand man came to California to take part in the gold rush there around 1850 or so , going home he had learned what to look for and discovered gold there, they made so much money they retired and the book mentioned how they enjoyed iced tea with ice from Maine , brought over on ships, sailing of course. must have been pricey !
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