"Porto Santo. View To Ponta Da Calheta From Portela Windmill. Site Of 10 Windmills At Campo De Baixo In Mid-Distance. 4 Jun 1976" Colour transparency of the topography of the island of Porto Santo, showing the view westwards to 'Ilheu de Baixo ou da Cal' from Mill No.8, Portela (Location of the group of mills No. 10 is in mid distance), taken on 4th June 1976. 4.6.1976