Published in Asa Gray correspondence. Senders B-Ba, in 1840, pages 1-4
Published in George Bentham letters to Asa Gray, 1839-1883, in 1840, pages 1
Published in George Bentham letters to Asa Gray, 1839-1883, in 1840, pages 1
Published in Alphonse de Candolle letters to Asa Gray, 1860-1890, in 1840, pages 1-0