| Reference | {Deposit:: STATE OF ILLINOIS DEPT. OF TRANS., DIVISION OF HIGHWAYS.}{Deposit:: SOURCES AND PRODUCERS OF AGGREGATES FOR HIGHWAY}{Deposit:: CONSTRUCTION IN ILLINOIS. BULL. 23, 1973, P. 57.}{Deposit:: STATE OF ILLINOIS DEPT OF TRANSPORTATION, DIVISION OF}{Deposit:: HIGHWAYS, SOURCES & PROCEDURES OF AGGREGATES FOR HIGHWAY}{Deposit:: CONSTRUCTION IN ILLINOIS, BULL. NO. 23, 1973, P. 57} |