The National Oceanic and Atmospheric Administration provides a photo library of severe weather formations. This photograph, captured by doppler radar, is of a tornado in its early stage of development in Union City, Oklahoma.

The National Oceanic and Atmospheric Administration provides a photo library of severe weather formations. This photograph, captured by doppler radar, is of a tornado in its early stage of development in Union City, Oklahoma, 1973.

The National Oceanic and Atmospheric Administration provides a photo library of severe weather formations. This photograph, captured by doppler radar, is of a tornado in its early stage of development in Union City, Oklahoma, 1973.

The National Oceanic and Atmospheric Administration provides a photo library of severe weather formations. This photograph, captured by doppler radar, is of a tornado in a mature stage of formation in Union City, Oklahoma, 1973.

The National Oceanic and Atmospheric Administration provides a photo library of severe weather formations and the instruments that measure them. Here you can find a photograph of the first Doppler weather radar built by the National...

The National Oceanic and Atmospheric Administration provides a photo library of severe weather formations. Using time-lapse photography, this image captures numerous cloud-to-ground lightning strokes during a nighttime thunderstorm in...

The National Oceanic and Atmospheric Administration provides a photo library of severe weather formations. Originally appearing in National Geographic Magazine, this photograph captures a lightning strike above Norman, Oklahoma.

The National Oceanic and Atmospheric Administration provides a photo library of severe weather formations. This photograph is of a tornado in its "Rope" stage, captured in Cordell, Oklahoma on May 22, 1981.

The National Oceanic and Atmospheric Administration provides a photo library of severe weather formations. This photograph is of a tornado in Cordell, Oklahoma on May 22, 1981.

The National Oceanic and Atmospheric Administration provides a photo library of severe weather formations. This photograph is of a tornado in the process of dying, captured in Cordell, Oklahoma on May 22, 1981.

The National Oceanic and Atmospheric Administration provides a photo library of severe weather formations and the instruments that measure them. Here you can find a photograph of the second Doppler weather radar built by the National...

The National Oceanic and Atmospheric Administration provides a photo library of severe weather formations and the instruments that measure them. Here you can find a photograph of the first doppler weather radar built by the National...

The National Oceanic and Atmospheric Administration provides a photo library of severe weather formations. Utilizing time-lapse photography, this image captures numerous cloud-to-ground lightning strikes during a nighttime thunderstorm...

A map from 1904 of the Indian Territory and Oklahoma Territory prior to statehood (November 16, 1907), showing the territorial capital of Tahlequah, reservation boundaries, railroads, and rivers. "Indian Territory had a area of 31,154...

Learn about the life and work of Angie Debo, an American historian who worked to help Native Americans gain civil rights.

This brief biography describes the career achievements of American cowgirl Lucille Mulhall.

This article in the June 29, 1921, issue of Nation magazine by Walter White, an NAACP official, reports on the massive damage to black-owned homes and businesses as a result of the Tulsa race riot on May 31, 1921.

This site has a concise summary of the contributions of composer Richard Rodgers to American music and theater. Centennial tribute provides a brief biography and extensive exploration of the musical influences which shaped Rodgers career.

Learn about the Lewis and Clark expedition member and military sergeant Nathaniel Pryor.

Learn about the military career and explorations of Nathaniel Hale Pryor.

Read about Bass Reeves, who escaped a life of slavery and became a United States marshall.

Learn about the work of American historian Angie Debo, who worked to help Native Americans preserve their civil rights.

This resource profiles the political career of Speaker of the House of Representatives Carl Albert. Includes a bibliography of relevant print resources.

Resource provides much information about the Delaware or Lenape tribes of Native Americans. Find pictures of men and women's clothing, a migration map, the history of the Nation, dances, and Native American food.