Title:A geometria nas aritméticas editadas para as escolas paroquiais luteranas do século xx no rio grande do sul, brasil / THE GEOMETRY ON ARITHMETICS EDITED FOR LUTHERAN PAROCHIAL SCHOOLS OF 20th CENTURY IN RIO GRANDE DO SUL, BRAZIL
Title:THE CONCEPTS OF ENVIRONMENT, ENVIRONMENT AND NATURE IN THE CONTEXT OF ENVIRONMENTAL ISSUE: DEFINING MEANINGS / Os conceitos de ambiente, meio ambiente e natureza no contexto da temática ambiental: definindo significados