Reproduction of illustration: "Ardgowan, Renfrewshire," Scotland, showing the ancient keep..., c1920 Creator: Frances Benjamin Johnston.
Reproduction of illustration: "Ardgowan, Renfrewshire," Scotland, showing the ancient keep of Inverkip with snowdrops, c1920. Photograph of an illustration of a watercolor by Mary G. W. Wilson, published in the book by Sir Herbert Maxwell, Scottish Gardens: Being a Representative Selection of Different Types, Old and New, London and New York: 1908, p. 25.