Reference | {Deposit:: 100 LARGEST QUARRIES, ROCK PRODUCTS, 1968, P. 60.}{Deposit:: CALCITE HISTORY, 2001, http:// www.mlo.net/calcite/history.html, MICHIGAN LIMESTONES OPERATIONS HISTORY. P. 1-8.}{Deposit:: USX REACHES AGREEMENT ON SALE OF MICHIGAN LIMESTONE OPERATIONS, 1987, SKILLING MINING REVIEW, P. 6} |