Dubuque is a city of 60 000 people located along the Mississippi River; at the junction where Iowa, Illinois, and Wisconsin meet. Because of this the area is known as the Tri-State Area.  This card comes from the Dubuque Arboretum and Botanical Garden established in 1980. The grounds are  230,000 m 2 .   It is staff entirely by volunteers - about 300 in total