The Spartan Twins (Dodo Press), Paperback

Lucy Fitch Perkins (1865-1937) was an American children's book author and illustrator, famous for writing the "Twins" series of books. Her books include The Dutch Twins (1911), The Japanese Twins (1912), The Irish Twins (1913), The Eskimo Twins (1914), The Mexican Twins (1915), The Cave Twins (1916), The Belgian Twins (1917), The French Twins (1918), The Spartan Twins (1918), Cornelia (1919), The Scotch Twins (1919), The Italian Twins (1920), The Puritan Twins (1921), The Swiss Twins (1922), The Filipino Twins (1923), The Colonial Twins of Virginia (1924), The American Twins of 1812 (1925), The American Twins of the Revolution (1926), Mr Chick: His Travels and Adventures (1926), The Pioneer Twins (1927), The Farm Twins (1928), Kit and Kat (1929), The Indian Twins (1930), The Pickaninny Twins (1931), The Norwegian Twins (1933), The Spanish Twins (1934), and The Chinese Twins (1935).