This is not officially volume 21 in the series (not enough papers were received to warrant this).
From the publisher's website:
As there was no 21st Symposium Volume produced due to the lack of papers presented to make a volume a 'Special Issue - Insects and Disease' of Physiological Entomology has been produced,
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I don't know how you got a book printed 26 years ago in the conditions that I received it (like new) but you do it! ABSOLUTELY AWESOME!
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