Author:Henrik Grönvold

Illustrator

 * (1907–14). The British Warblers: A History with Problems of Their Lives. R. H. Porter. 9 vols.
 * Volume 1 (February 1907):
 * Volume 2 (March 1908):
 * Volume 3 (February 1909):
 * Volume 4 (December 1909):
 * Volume 5 (November 1910):
 * Volume 6 (December 1911):
 * Volume 7 (November 1912):
 * Volume 8 (December 1913):
 * Volume 9 (October 1914):


 * Howard, Eliot (1920) Territory in Bird Life