1. Rare elements in coals;Abernathy;U.S. Bur. Mines, Inf. Circ. 8163,1963
2. Spectrochemical analyses of coal ashes for trace elements;Abernathy;U.S. Bur. Mines, Invest. Rep. 7281,1969
3. Major and minor elements of some British Carboniferous coals and their relationship to coal type;Asuen;Ph.D. Thesis, Univ. Newcastle upon Tyne,1984
4. The petrographic character and sedimentary environment of the Harvey-Beaumont Seam of Northumberland and Durham;Bell;Ph.D. Thesis, Univ. Newcastle upon Tyne,1966
5. The role of organic matter in the accumulation of uranium;Breger,1974