PLATE 17. SWEET GUM, HACKBERRY, AND GINGKO. 



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Sweet Gum, leaves and fruit. 2. Hackberry in winter. 3. Gingko, winter 

 twig. 4. Gingko, leaves. 5. Street of Gingkos, leading from grounds of the 

 United States Department of Agriculture, Washington, D. C. Thirty years old. 



