NATURAL RESOURCE MODELING

Spring 1998, Volume 11, Number 1

CONTENTS

• Introduction to Special Issue
  By L.H. Erbe and H.I. Freedman

• Discontinuous Forcing of Periodic Solutions in ${\cal C}^1$ Vector
  Fields with Applications to Population Models
  By J. Robert Buchanan

• Practical Persistence in Diffusive Food Chain Models
  By Robert Stephen Cantrell and Chris Cosner

• Stability and Bifurcations in an Environmental Recovery Model
  of Economic Agriculture-Industry Interactions
  By M. Solomonovich, H.I. Freedman, L.P. Apedaile,
  S.G.M. Schilizzi and L. Belostotski