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Riaza. - Instituto Geológico y Minero de España

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WARD, D. DE (1950). Palingenetic structures in augen gneis of the Sierra <strong>de</strong> Guadarrama, Spain.<br />

Bull. Com. Geol. Finlan<strong>de</strong>, 23 : 51-66.<br />

WILDBERG, H.G.H. BISCHOFF, L, BAUMANN, A.(1989).Pb ages of zircons from meta-igneous and<br />

meta-sedimentary rocks of the Sierra. Contributions Mineral Petrology, 103, 253-262.<br />

YARDLEY, B.W.D. (1989). An introduction to Metamorphic Petrology. 248 pp. Longman Earth<br />

Science Series.<br />

ZIEGLER, A.M. (1982). Geological Atlas of western and Central Europe. Shell B.V. Rijowijk, The<br />

Netherlands, 133 pp.<br />

179

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