U.S. shipments of limestone on the Great Lakes increased to 3.1 million tons in July, an 8.7 percent increase compared to last year. The trade was also above the month’s 5-year average by 3.2 percent.Year-to-date, the Lakes limestone trade stands at 10.1 million tons…<p><p>https://www.marinelink.com/news/july-trade-us-great-lakes-limestone-541807</p></p>