Today, each field guide has its own range, focus and organization.

I like to think of that last one as a field guide to fields.

More than 20 years ago, he began thinking about producing a field guide.

However, the name has been adopted in some recent field guides.

This one didn't show up in any field guide on insects.

The book can be read as a kind of field guide to urban survival.

He wrote a number of field guides, other books, articles and notes.

He took up his field guide with patient interest in our plight.

It has an online field guide of plants and animals called Enature.com.

For, to hear him tell it, the field guides are his burden.