Plates prepared between the years 1849 and 1859, to accompany a report on the forest trees of North America
Asa Gray
4 p. 23 col. pl. 34 cm.
Washington: Smithsonian Institution, 1891

About this work:
Smithsonian institution publication 800. The above is only a fragment of the work projected by Dr. Gray but not completed, and the plates bear the numbers intended for the original work.