1. Guest Editors' Introduction to a Special Issue in Memory of Alfred Gray (1939–1998)

   • Karsten Grove
   • Jonathan Rosenberg

   Editorial Introduction Pages: 205 - 206

2. On Tangent Sphere Bundles with Small or Large Constant Radius

   • Oldřich Kowalski
   • Masami Sekizawa

   OriginalPaper Pages: 207 - 219

3. Spin Spaces, Lipschitz Groups, and Spinor Bundles

   • Thomas Friedrich
   • Andrzej Trautman

   OriginalPaper Pages: 221 - 240

4. On Pappus-Type Theorems on the Volume in Space Forms

   • Alfred Gray
   • Vicente Miquel

   OriginalPaper Pages: 241 - 254

5. Surfaces in Conformal Geometry

   • T. J. Willmore

   OriginalPaper Pages: 255 - 264

6. Almost Complex Poisson Manifolds

   • Luis A. Cordero
   • Marisa Fernández
   • Luis Ugarte

   OriginalPaper Pages: 265 - 290

7. Riemannian, Symplectic and Weak Holonomy

   • Lorenz J. Schwachhöfer

   OriginalPaper Pages: 291 - 308

8. Twistors and Cartan Connections

   • D. V. Alekseevsky
   • M. M. Graev

   OriginalPaper Pages: 309 - 330

9. Flag Duality

   • Alan T. Huckleberry
   • Joseph A. Wolf

   OriginalPaper Pages: 331 - 340

10. Sculpture Inspired by Alfred Gray

    • Helaman Ferguson

    OriginalPaper Pages: 341 - 345

11. Eigenfunction Expansions on Geodesic Balls and Rank One Symmetric Spaces of Compact Type

    • Mark A. Pinsky
    • William O. Bray

    OriginalPaper Pages: 347 - 369

12. Total Extrinsic Curvature of Certain Distributions on Closed Spaces of Constant Curvature

    • F. B. Brito
    • A. M. Naveira

    OriginalPaper Pages: 371 - 383

13. Examples of Minimal Unit Vector Fields

    • J. C. González-Dávila
    • L. Vanhecke

    OriginalPaper Pages: 385 - 404

14. Calibrated Embeddings in the Special Lagrangian and Coassociative Cases

    • Robert L. Bryant

    OriginalPaper Pages: 405 - 435

15. Global G-Manifold Reductions and Resolutions

    • Karsten Grove
    • Catherine Searle

    OriginalPaper Pages: 437 - 446