1. Urban trees

   • William H. Smith

   Forum Pages: 291 - 291

2. The world needs a resource policy for the twenty-third century

   • Jon Ghiselin

   Forum Pages: 291 - 295

3. Natural environmental impact assessment: A rational approach

   • J. L. Gevirts
   • P. G. Rowe

   Erratum Pages: 295 - 295

4. Energy analysis and the coupling of man and estuaries

   • Howard T. Odum
   • W. Kemp
   • M. Lehman

   Research Pages: 297 - 315

5. Removal of atmospheric particles by leaves and twigs of urban trees: Some preliminary observations and assessment of research needs

   • William H. Smith
   • Brian J. Staskawicz

   Research Pages: 317 - 330

6. Net drift in an atypical estuary, Long Island Sound

   • David F. Paskausky

   Research Pages: 331 - 342

7. Changes in flood-plain vegetation and land use along the Missouri River from 1826 to 1972

   • Thomas B. Bragg
   • Annehara K. Tatschl

   Research Pages: 343 - 348

8. Book reviews

   • S. I. Schwartz
   • Kenneth E. Cox
   • Andrew S. Carron

   Literature Pages: 349 - 353

9. Books received

   Literature Pages: 353 - 353

10. Abstracts

    • Donigian A. S. Jr.
    • Crawford N. H.
    • Kuenzier E. J.

    Literature Pages: 354 - 369

11. Bibliographies

    • Caroline Schillaber
    • Sally Schauman
    • Sutyagin P. G.

    Literature Pages: 369 - 374

12. Citations

    Literature Pages: 374 - 384