small insects

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I wonder if anybody can help me,I have only just recently been introduced to
entomology and would like to research something   i.e. the very small in the
insect world either nearly microscopic or indeed microscopic, to my
embarrassment I neither know what the study of these insects is called or
were to even begin to look,so if anyone could point me in the right
direction I would be very grateful.
Thanking you in advance Andrew Murphy