East of Mississippi River, North of Ohio and Potomac Rivers:
Connecticut,
Delaware,
District of Columbia,
Illinois,
Indiana,
Maine,
Maryland,
Massachusetts,
Michigan,
New Hampshire,
New Jersey,
New York,
Ohio,
Pennsylvania,
Rhode Island,
Vermont,
Wisconsin
Northern part of US between western edge of Lake Superior and Pacific Ocean:
Idaho,
Iowa,
Kansas,
Minnesota,
Missouri,
Montana,
Nebraska,
North Dakota,
Oregon,
South Dakota,
Washington,
Wyoming