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Ophisaurus ventralis.

Ophisaurus ventralis. (1842)

John Edwards Holbrook (American, 1796 – 1871)
Opothle Yoholo. A Creek Chief

Opothle Yoholo. A Creek Chief (1837)

Charles Bird King (American, 1785 - 1862)
Opposite Dutch gap

Opposite Dutch gap (1864)

Alfred Rudolph Waud (American, 1828 - 1891)
Opposite Dutch Gap.

Opposite Dutch Gap. (1864)

Alfred Rudolph Waud (American, 1828 - 1891)
Oprah Winfrey standing as her attorney, Charles Babcock, questions plaintiff Bill O’Brien on the witness stand while the judge and others in the courtroom look on

Oprah Winfrey standing as her attorney, Charles Babcock, questions plaintiff Bill O’Brien on the witness stand while the judge and others in the courtroom look on (1998)

Brigitte Woosley (American, 20th Century)
Oprah Winfrey watches as her attorney, Charles Babcock, questions plaintiff Bill O’Brien on the witness stand

Oprah Winfrey watches as her attorney, Charles Babcock, questions plaintiff Bill O’Brien on the witness stand (1998)

Brigitte Woosley (American, 20th Century)
Optimal calcium intake

Optimal calcium intake (1994)

National Institutes of Health (American, 1887-)
Options

Options (1917)

Dean Cornwell (American, 1892-1960)
Opuntia basilaris

Opuntia basilaris (1915)

Margaret Armstrong (American, 1867-1944)
Opuntia: Prickly Pear

Opuntia: Prickly Pear (1908)

Deborah Griscom Passmore (American, 1840–1911)
Opuntia: Prickly Pear

Opuntia: Prickly Pear (1899)

Deborah Griscom Passmore (American, 1840–1911)
Opuntia: Rose Prickly Pear

Opuntia: Rose Prickly Pear (1904)

Deborah Griscom Passmore (American, 1840–1911)
Or bust

Or bust (1912)

Udo Keppler (American, 1872 – 1956)
Oracle (‘Genuine oracle imported from Delphi’) seated cross-legged in cloud of smoke

Oracle (‘Genuine oracle imported from Delphi’) seated cross-legged in cloud of smoke (1909)

Louis Glackens (American, 1866-1933)
Oral Tradition (After John White Alexander)

Oral Tradition (After John White Alexander) (1902)

A.V. Nye (American, 19th/20th Century)
Oral Tradition mural in Evolution of the Book series

Oral Tradition mural in Evolution of the Book series (1896)

John White Alexander (American, 1856-1915)
Oral traditions

Oral traditions (1896)

John White Alexander (American, 1856-1915)
Orange and yellow poncho-type costume with under-dress sketch

Orange and yellow poncho-type costume with under-dress sketch (1920 - 1921)

Will R. Barnes (American, ?-1939)
Orange Lake Brand Citrus Label

Orange Lake Brand Citrus Label (1930-1950)

Anonymous
Orange Lake Brand Florida Vegetables Label

Orange Lake Brand Florida Vegetables Label (1938)

Anonymous
Orange Mariposa Tulip

Orange Mariposa Tulip (1915)

Margaret Armstrong (American, 1867-1944)
Orange Polygala (Polygala lutea)

Orange Polygala (Polygala lutea) (1926)

Mary Vaux Walcott (American, 1860-1940)
Orange Polygala. Polygala lutea

Orange Polygala. Polygala lutea (1925)

Mary Vaux Walcott (American, 1860-1940)
Orange Road, Tarpon Springs

Orange Road, Tarpon Springs (1893)

George Inness (American, 1825-1894)
Orange then Blue.

Orange then Blue.

U.S. Information Agency (American, 1953-1999)
Orange Trees And Gate

Orange Trees And Gate (1885)

Winslow Homer (American, 1836-1910)
Orange-crowned warbler

Orange-crowned warbler (1827–1838)

John James Audubon (American, 1785-1851)
Orange-Eye Globemallow (Sphaeralcea davidsonii)

Orange-Eye Globemallow (Sphaeralcea davidsonii) (1926)

Mary Vaux Walcott (American, 1860-1940)
Orange-eye Globemallow. Sphaeralcea davidsonii

Orange-eye Globemallow. Sphaeralcea davidsonii (1925)

Mary Vaux Walcott (American, 1860-1940)
Orangerie Of The Chase Villa In Florence

Orangerie Of The Chase Villa In Florence (circa 1910)

William Merritt Chase (American, 1849-1916)