1. On the possibility of creating a radio-astronomical inertial coordinate system based on the measurement of arcs between QSOs with the aid of VLBI

   • A. F. Dravskikh
   • A. M. Finkelstein
   • G. A. Krasinsky

   OriginalPaper Pages: 255 - 266

2. A search for discrete gamma-ray sources of energy greater than 2×10¹² eV

   • A. A. Stepanian
   • B. M. Vladimirsky
   • V. P. Fomin

   OriginalPaper Pages: 267 - 282

3. A classification of the available astrophysica data of particularHii regions

   • C. Goudis

   OriginalPaper Pages: 283 - 300

4. The evolution of massive close binaries

   • J. -P. de Grève
   • C. de Loore
   • W. Sutantyo

   OriginalPaper Pages: 301 - 312

5. Progress in ultraviolet stellar spectrophotometry with S59

   • C. De Jager
   • H. J. G. L. M. Lamers
   • K. A. Van Der Hucht

   OriginalPaper Pages: 313 - 325

6. XUV emission from above the solar west limb near 20:00 UT, January 17, 1974

   • R. Tousey

   OriginalPaper Pages: 327 - 336

7. Evidence for a temperature rise in the outer layers of α Lyrae, fromCopernicus observations of lyman-α

   • Françoise Praderie
   • Eduardo Simonneau
   • Theodore P. Snow Jr.

   OriginalPaper Pages: 337 - 343

8. Computedn=2 level populations in helium-like ions from Cv to Nixxvii

   • R. Mewe
   • J. Schrijver

   OriginalPaper Pages: 345 - 352

9. High temperature plasma inβ Lyrae, observed fromCopernicus

   • Yoji Kondo
   • Margherita Hack
   • Ronald S. Polidan

   OriginalPaper Pages: 353 - 358

10. Ultraviolet solar identifications based on extended absorption series observed in the laboratory spectrum of Sii

    • C. E. Moore
    • R. Tousey
    • S. G. Tilford

    OriginalPaper Pages: 359 - 364

11. Discrepancies between calculated and observed Fexvii and Nixix solar coronal lines

    • M. Loulergue
    • H. Nussbaumer

    OriginalPaper Pages: 365 - 368

12. Density dependence of the line emission of boron-like coronal ions

    • G. Elwert
    • P. K. Raju

    OriginalPaper Pages: 369 - 375

13. Plasma polarization shift: An improved quantum-mechanical treatment

    • S. Volonté

    OriginalPaper Pages: 377 - 380

14. An anomalous velocity neutral hydrogen structure near the galactic center

    • I. F. Mirabel
    • K. C. Turner

    OriginalPaper Pages: 381 - 394

15. Symmetric periodic orbits in Størmer's problem

    • A. G. Mavraganis

    OriginalPaper Pages: 395 - 401

16. La distance de la Nova Delphini 1967

    • Iradj Malakpur

    OriginalPaper Pages: 403 - 406

17. Gravitational potential energy of a disk-sphere pair of galaxies

    • G. M. Ballabh

    OriginalPaper Pages: 407 - 418

18. The cascading of cosmic-ray nuclei in various media

    • Phyllis S. Freier
    • C. J. Waddington

    OriginalPaper Pages: 419 - 436

19. On pair production in intense electromagnetic fields occurring in astrophysical situations

    • J. K. Daugherty
    • I. Lerche

    OriginalPaper Pages: 437 - 445

20. The next galactic supernova

    • Sidney van den Bergh

    OriginalPaper Pages: 447 - 456

21. Reexamination of the correlation of galaxies and QSO's

    • Peter D. Noerdlinger

    OriginalPaper Pages: 457 - 468

22. A new test for Alfvén waves in interplanetary space

    • A. J. Owens

    OriginalPaper Pages: 469 - 473

23. Application of the theory of jet stream to the asteroidal belt

    • Wing-Huen IP

    OriginalPaper Pages: 475 - 481

24. Resonant interactions between fast particles and collision-dominated MHD waves

    • D. B. Melrose

    OriginalPaper Pages: 483 - 493

25. Abstracts of forthcoming papers

    Abstract Pages: 495 - 499

26. Antimatter bodies and closure of the Universe

    • Robert E. Wilson

    Letters to the Editor Pages: L9 - L11

27. A proto-planetary contribution to interstellar dust

    • D. A. Mendis
    • N. C. Wickramasinghe

    Letters to the Editor Pages: L13 - L17