valleys (landforms)

early 20th century - mid-20th century | oil on canvas

Bert Geer Phillips

late 19th century - early 20th century | oil on board

September 11, 1906 | purple colored pencil on paper

late-19th century - early 20th century | graphite on paper

1873 | watercolor and gouache over graphite on paper

1949 | watercolor on paper on secondary board

late 19th century - early 20th century | gelatin silver process