ABERNETHY, R. F. Rare elements in coal. U. S. Bureau of Mine, Inf. Circ. 1963
BACHMAN, G. O. Uranium-bearing coal and carbonaceous shale in the La Ventana Mesa area, Sandoval Country, New Mexico. U. S. Geol. Surv. Bull. 1959, 1055-J, 295-307
BEATON, A. P. The geochemistry and petrography of lignites from southern Saskatchewan, Canada. J. Coal Quality. 1989, 8, 110-117
BECK, H. L. Perturbations on the natural radiation environment due to the utiliation of coal as an energy source. Proceedings of Symposium on the Natural Radiation Environment-III. 1979, 25-35