“Permanences and Alterations - The Urban Heritage of Guimarães in the 19th-20th centuries” is a work by Maria José Meireles, museologist and researcher. It corresponds, except for a few changes, to her master's thesis that she presented to the University of Minho in 2000. Since then, and even though it was never printed in a physical edition, her research has been a reference work in Guimarães' historiography. The text is published in a partnership between Muralha, the Guimarães Heritage Defence Association and the Casa da Memória de Guimarães.