The maps in The World of Ice and Fire have little symbols for export industries – marble in the Vale, olives in Dorn, and so on. Sometimes these aren’t mentioned in the text, so do you think they’re consistent with the original books?

Sort of? 

It’s a bit selective and kind of screwy – lumber is not the North’s only export, cattle aren’t only found in the Riverlands (and honestly the only big herds we hear about are in the Westerlands so…shrug), iron and tin are not found only in the Iron Islands, the gold mines of the Westerlands aren’t only in the north (Silverhill should have some mines near it, ffs), there’s no symbol for wine on the bloody Arbor, I don’t see how the Stormlands has much of an economy on amber, and given how often Dornish red is mentioned, you’d think they’d put it on the maps…

To raise a personal bone of contention: Vale map is completely screwed up, putting the Mountains of the Moon east rather than west of the Eyrie, basically smack-dab on top of the Vale which is a huge agricultural region. And there’s a bit of weirdness with the Vale exporting marble but for some reason the Eyrie is built from Tarth marble.

But I don’t see anything that’s blatantly contradicted by the books.