9780387940625 | Springer Verlag, October 1, 1993, cover price $59.95 | About this edition: This book highlights the importance to ecological studies of incorporating humans and their effects on ecosystems.

9780387982434 | Springer Verlag, May 1, 1997, cover price $69.99 | About this edition: Highlighting the importance to ecological studies of incorporating humans and their effects on ecosystems, leading experts from a variety of disciplines address a number of important issues, including:* the prominent role of humans in the function of ecosystems on Earth* why humans have been ignored in ecological studies* approaches taken by social scientists, historians, geographers, economists, and anthropologists in the study of human activities* the emergence of a new ecological paradigm accommodating human activities* methods for studying subtle human effects, and human- populated ecosystems * future research and training required to include humans effectively as components of ecological systems.

9780198561767 | Clarendon Pr, July 1, 1986, cover price $70.00

9780198562290 | Reprint edition (Clarendon Pr, December 1, 1989), cover price $45.00 | also contains The Attenbury Emeralds