Good,No Highlights,No Markup,all pages are intact, Slight Shelfwear,may have the corners slightly dented, may have slight color changes/slightly damaged spine.

A comprehensive study of the biological and chemical characteristics of rivers and streams and the life cycles of numerous plants and animals

An intensive biological study of the larval stage of caddis flies. Deals specifically with British flies but also includes a section that refers to American literature on the subject. Includes over 100 descriptions of caddis larvae.