"Emerald and aquamarine have been known and cherished since Antiquity, but it is only in the last few centuries that science has realized that these two coveted gems are actually different varieties of the same mineral -- Beryl. Number 7 in the popular extraLapis English mineralogy monograph series, "Beryl: And Its Color Varieties" surveys the mineralogy and localities of this popular gemstone."
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"Estudio histórico sobre la caña de azúcar en Tucumán, enfocando el proceso de liquidación y desmantelamiento de once ingenios azucareros durante el gobierno militar de Juan CarlosOnganía en 1966 y, la naturaleza y estructura del Estado argentino. Describe la relación entre la evolución de la industria azucarera, sociedad tucumana y crisis económica-social causada por el cierre de estos ingenios y, su conexión con el "Operativo Independe ..."