1962. 2012-08-27T18:47:08Z. 2015-03-17T22:02:57Z. Ramirez, Leon F. U.S. Geological Survey. English&Arabic. Public. Rubʻ al-Khali and Saudi Arabia.
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1963. 2012-08-27T18:39:29Z. 2015-03-17T22:02:57Z. Ramirez, Leon F. The Survey. English&Arabic. Public. Rubʻ al-Khali and Saudi Arabia.
3. Geology of the southeastern Rub al Khali quadrangle, Kingdom of Saudi Arabia [cartographic material]
1963. 2012-08-27T18:45:43Z. 2015-03-17T22:02:57Z. Ramirez, Leon F. The Survey. English&Arabic. Public. Saudi Arabia.
