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A good field guide (right) is the best reference source for non-specialists to identify an unknown insect or spider. Field guides generally have photographs, distribution maps and life histories for the common species in a particular area, organized in some logical grouping.
Field guides usually are written for a particular region such as North America, or the eastern US, or the western US, and so on. They can also specialize in a particular insect group such as beetles or butterflies.
In general, the more specific a field guide is in terms of group and regional coverage the more detailed the information will be, but this comes at the expense of broad coverage. So, for example, a field guide of the beetles of Oregon will contain far more detail about the beetles of Oregon than will a field guide about the insects of North America. I like more narrowly focused books because they give me the detailed coverage I need but they can be more difficult to use until you are somewhat familiar with the topic.
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