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1963. 2012-08-27T17:19:42Z. 2015-03-17T22:02:56Z. Elberg, Edward L. The Survey. English&Arabic. Public. Rubʻ al-Khali and Saudi Arabia.
3. Geology of the northeastern Rub al Khali quadrangle, Kingdom of Saudi Arabia [cartographic material]
1961. 2012-08-27T15:58:10Z. 2013-03-18T20:21:20Z. Bramkamp, Richard A. U.S. Geological Survey. English. Public. Saudi Arabia and Rubʻ al-Khali.
4. Geology of the northwestern Rub al Khali quadrangle, Kingdom of Saudi Arabia [cartographic material]
1959. 2012-08-27T15:50:23Z. 2015-03-17T22:02:56Z. Bramkamp, Richard A. The Survey. English&Arabic. Public. Saudi Arabia and Rubʻ al-Khali.
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.
