31. The ability of lignosulfonates to reduce the viscosity of mineral slurries is used to advantage in quebracho ( a tropical tree ). 32. He participated in the Revolution of Quebracho , wrote in the newspaper El D�a and was Interior Minister from 1903 to 1904. 33. Ordinary or warm soluble quebracho ( also known as insoluble quebracho ) is the natural extract obtained directly from the quebracho wood. 34. Ordinary or warm soluble quebracho ( also known as insoluble quebracho ) is the natural extract obtained directly from the quebracho wood. 35. Ordinary or warm soluble quebracho ( also known as insoluble quebracho ) is the natural extract obtained directly from the quebracho wood. 36. The violence delayed the opening of the trial of the four members of Quebracho , a group known for leading anti-government protests. 37. Quebracho trees ( " Schinopsis balansae " and " Aspidosperma quebracho-blanco " ) can frequently be found there.38. Quebracho trees ( " Schinopsis balansae " and " Aspidosperma quebracho -blanco " ) can frequently be found there. 39. The quebracho tree, from which tannin is extracted, is grown in a region that covers northern Argentina and parts of Bolivia and Paraguay. 40. Forests of " quebracho colorado chaque�o " ( " Schinopsis balansae " ) were once located in the north of Corrientes.
