LE VOLCANO-SEDIMENTAIRE DE LA REGION D'ALCOUTIM (BAIXO ALENTEJO-PORTUGAL).LECA X.1976; COMUNIC. SERV. GEOL. PORTUG.; PORTUG.; DA. 1976; NO 60; PP. 139-149; H.T. 1; BIBL. 1 P.; 2 ILL.; 1 CART.; (3A. REUN. GEOL. SUDOESTE PENINSULA IBERICA; HUELVA-BEJA; 1975)Conference Paper

Discovery of concealed massive-sulphide bodies at Neves-Corvo, southern Portugal : A case historyLECA, X.Transactions of the Institution of Mining and Metallurgy. Section B. Applied earth science. 1990, Vol 99, pp 139-152, issn 0371-7453Article

New trends in geological concepts. Discussion and reply = Nouvelles tendances dans les concepts géologiques. Discussion et réponseMORRISSEY, C. J; LECA, X.Transactions of the Institution of Mining and Metallurgy. Section B. Applied earth science. 1986, Vol 95, issn 0371-7453, 218Article

GEOLOGY AND MINERAL RESOURCES OF THE JIBAL KHUFF QUADRANGLE, KINGDOM OF SAUDI ARABIA 1/100000.EIJKELBOOM G; HENRY B; LECA X et al.1971; MINER. INVEST. MAP; 1971, NUM. 0019Miscellaneous

Caractéristiques principales du gisement de Neves-Corvo (Portugal)LECA, X; ALBOUY, L; AYE, F et al.Chronique de la recherche minière. 1985, Num 481, pp 53-58, issn 0182-564XArticle

GEOLOGY AND MINERAL RESOURCES OF THE AL AMAR-AR RAYN QUADRANGLE (WITH TEXT).EIJKELBOOM G; GENDI M; HENRY B et al.1969; MINER.INVEST.MAP.; 1969Miscellaneous

Les isotopes du plomb : Un nouvel outil pour la recherche minière. Application aux chapeaux de fer du PortugalCALVEZ, J.Y; MARCOUX, E; LECA, X et al.Colloque PIRSEM. 1986, 36Conference Paper

GEOLOGY AND MINERAL RESOURCES OF THE AL AMAR-AR RAYN QUADRANGLE (WITH TEXT).EIJKELBOOM G; GENDI M; HENRY B et al.1969; MINER.INVEST.MAP.; 1969Miscellaneous

Cadre géologique des minéralisations de Neves Corvo (Baixo-Alentejo, Portugal). Lithostratigraphie, paléogéographie et tectoniqueLECA, X; RIBEIRO, A; TOMAS OLIVEIRA, J et al.Mémoires du BRGM (Paris). 1983, Num 121, issn 0071-8246, 79 p.Map