If text is really small, I find it best to change to landscape mode, zoom until the text reaches the edges of the viewing area, and then switch to continuous scroll mode. iPDF (the software) not only keeps track of your history of page views, but separately your history of zooming. So I can zoom all the way in if text is still too small, do some scrolling, then hit the 'back zoom' button to go back to my previous zoom level.
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