LOCATIONS SUBMITTING DATA FOR 1994 State Location Code District of Columbia Washington Monument Grounds DC1 Idaho Rathdrum ID3 Illinois Carbondale IL2 Iowa Ames IA1 Maryland Beltsville UB1 Maryland Silver Spring MD1 Missouri St. Louis MO3 Nebraska Lincoln NE1 New Jersey North Brunswick NJ1 New Jersey Pittstown NJ2 New York Ithaca NY1 Oregon Hubbard OR1 Rhode Island Kingston RI1 Virginia Norton VA6 Washington Pullman WA1