Map[s] of the central portion of the Cascade mountains, Washington, showing the distribution of Red Fir, (Yellow Pine, Mertens Hemlock, Red Cedar [and] Engelmann Spruce / 
Julius Bien & Co.
[Washington, D.C. :  Department of the Interior, 
1902]
In: United States Geological Survey. Professional Paper. No. 6. Pl. 2-6.