S470 (B4 I79–80)
F: Van Gogh Sunflowers in a Vase Amsterdam V. G. Found. 48944 (t)
B: School of Visual Arts Library (t)
[Van Gogh, Still Life: Vase with Fifteen Sunflowers, 1889, oil on canvas.
A reproduction available here.]

S471 (B4 I79–80)
F: Van Gogh Sunflowers, 1888 o/c 77988 (t)
B: School of Visual Arts Library (t)
[Van Gogh, Still Life: Vase with Twelve Sunflowers, 1888.
A reproduction available here.]