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I found the answer to this while trying some other Google searches before posting my question. The answer is that "turf" is actually peat, which was the primary source of fuel in Ireland at the time, used in cooking and heating. There were even peat-powered locomotives. Today, there is at least one company that still uses peat in powering their boilers. In Ireland, the term "turf" still refers to the peat so prevalent in the country. The word, "rick" is used in the definition Google gives as "a stack of hay, corn, straw, or similar material, especially one formerly built into a regular shape and thatched." So, the answer is that a "turf rick" is a large pile of peat used for heating purposes.