23 poems written by Oakley's mother, Imogen Brashear Oakley (1854-1933) Six Historic Homesteads (1935 and 1962, University of Pennsylvania Press), a book describing six Colonial-era mansions, also written by his mother. Both of his mother's books were published posthumously to her death. and, most notably, a series of eight travel books authored by his wife, Amy Oakley, each containing more than a hundred of his pen-and-ink illustrations: Hill-Towns of the Pyrenees (1923, Century; 1924, John Long Ltd.) Cloud-Lands of France (1927, Century) Enchanted Brittany (1930, Century) The Heart of Provence (1936, D. Appleton-Century) Scandinavia Beckons (1938, D. Appleton-Century) Behold the West Indies (1941 (1st), 1943 (2nd), D. Appleton-Century; 1951, Longmans Green) Kaleidoscopic Quebec (1947, D. Appleton-Century; 1952, Longmans Green) Our Pennsylvania: Keys to the Keystone State (1950, Bobbs-Merrill) Though Oakley illustrated many books, he was the author of only one. In 1943, he published a short monograph as a tribute to his long-time friend and fellow artist, Cecilia Beaux, who had died in the previous year. Oakley met Beaux when he was only 17, and he remained one of Beaux's closest friends until the end of her life, even though she was 26 years his senior. Beaux achieved considerable fame as a portrait artist, and Oakley included a 1911 sketch that Beaux drew of him in the book. His wife Amy's book, The Heart of Provence (q.v.), was also dedicated to Beaux. Magazine illustrations The following list is representative of the many magazines for which Oakley produced illustrations. In most instances, he illustrated the articles of others, but for some articles, he was both author and illustrator: The American Magazine of Art - 1919, 1925 Appleton's Magazine - 1907 Asia - 1918 Century - 1905-1912, 1916-1919 Collier's - 1904-1918 Everybody's - 1906-1909 Harper's Monthly Magazine - 1905, 1906, 1907, 1908–1915, 1916, 1918 International Studio - 1913, 1915 Ladies' Home Journal - 1908 Leslie's - 1904 Metropolitan - 1907-1910 National Geographic Magazine - 1942, 1943, 1945 Nation's Business - 1919 Pennsylvania Magazine - 1947 Scientific American - 1918 St. Nicholas Magazine - 1908-1909 Scribner's Magazine - 1905-1916 System - 1909 The Forum - 1926-1927 Western Pennsylvania Historical Magazine - 1948 One notable magazine article, which Oakley wrote but did illustrate, was a tribute to his friend and fellow artist, Lucy Scarborough Conant, who had recently died. In this article, written in 1921, Oakley presented his own definition of an artist: See