00750cam a22002531  4500001001300000003000400013005001700017008004100034010001700075035002000092040004200112042001200154050002200166051002600188100003500214245004200249260002700291300003300318440007300351504002500424650001800449650001300467650001600480gs 58000018 DLC20260227111406.0850312s1956    bl ab    b    001 0 por c  ags 58000018   a(OCoLC)11795962  aU.S. Geol. Survey. Libr.cGUdGUdDLC  apremarc00aTN41b.A35 no. 80  aTN948.C3bL4cCopy 2.1 aLeonardos, Othon Henry,d1899-10aCarbonatitos com apatita e pirocloro.  aRio de Janeiro,c1956.  a30 p.bmaps, diagrs.c24 cm. 0aBrazil. Divasão de Fomento da Produção Mineral. Avulsovno. 80  aBibliography: p. 28. 0aCarbonatites. 0aApatite. 0aPyrochlore.