00704cam a22002171  4500001001300000003000400013005001700017008004100034010001700075035002000092040004700112042001200159050001800171100003900189245003700228260002700265300004100292500010100333504002800434650002400462s  41000049 DLC20260227111912.0850617s1939    bl abf   b    000 0 por c  as  41000049   a(OCoLC)12166731  aSmithsonian Institution. LibrarycDSIdDLC  apremarc00aTN948.D5bA231 aAbreu, Sylvio Fróes,d1902-1972.10aKieselguhr nacional (diatomito).  aRio de Janeiro,c1939.  a70 p.bplates, maps, diagrs.c24 cm.  aAt head of title: Instituto Nacional de Technolgia (Ministerio do Trabalho, Industria e Comercio  aBibliography: p. 69-70. 0aDiatomaceous earth.