div class=ts-pagebutton class=gotoPage data-page=1Page 1button div class=ts-imageimg data-url=international-congress-of-tropical-and-sub-tropical-agriculturehtmlpage=1 data-page=1 class=ts-thumb lazyload alt=Page 1: International Congress of Tropical and Sub-Tropical Agriculture loading=lazy src=data:imagegifbase64iVBORw0KGgoAAAANSUhEUgAAAAIAAAACCAQAAADYv8WvAAAAD0lEQVR42mP8X8AwAgiABKBAv+vAXklAAAAAElFTkSuQmCC data-src=https:reader031vdocumentssitereader031viewer2022020405575067de1a28ab0f07ad8779html5thumbnails1jpg width=140 height=200 divp© 1939 Nature Publishing Grouppdiv