There is a great book by Simon Winchester called Krakatoa. I read it a few years ago and recommend it. You can still buy it online from chapters.
My only direct experience with a volcanic eruption came here in Calgary back in May of 1980. I was a little guy but still remember the ash cloud from Mount St. Helens falling on us. It didn't block out all light like it did closer to the eruption but it did obscure the Sun. Just like during a big snowstorm in the winter only it was grey instead of white in colour. The ash flakes were bigger than our typical snowflakes here in Calgary and the smell I will always remember. It lasted about a day and it had all blown away two days later.
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