Letter from Orville Derby

Copy of official letter from Orville Derby, first director of the Geological and Mineralogical Service of Brazil, in which the Museum was included, dated January 25, 1907, where he proposes to the Minister of Industry, Transport and Public Works, the hiring, among others, by engineers Miguel Arrojado Ribeiro Lisboa (1872-1932), Francisco de Paula Oliveira (1857-1935) and Luiz Felipe Gonzaga de Campos.