div class=ts-pagebutton class=gotoPage data-page=1Page 1button div class=ts-imagea href=https:reader042vdocumentsusreader042viewer2022020522575067c91a28ab0f07ad230fhtml5page1jpg target=_blank img data-url=an-introduction-to-regional-surveyinghtmlpage=1 data-page=1 class=ts-thumb lazyload alt=Page 1: An Introduction to Regional Surveying loading=lazy src=data:imagegifbase64iVBORw0KGgoAAAANSUhEUgAAAAIAAAACCAQAAADYv8WvAAAAD0lEQVR42mP8X8AwAgiABKBAv+vAXklAAAAAElFTkSuQmCC data-src=https:reader042vdocumentsusreader042viewer2022020522575067c91a28ab0f07ad230fhtml5thumbnails1jpg width=140 height=200 adivp© 1931 Nature Publishing Grouppdiv