1. On shear free normal flows of a perfect fluid

   • A. Barnes

   Research Articles Pages: 105 - 129

2. On one new effect of the Einsteinian theory of gravitation

   • M. F. Shirokov

   Research Articles Pages: 131 - 136

3. The linear theory of gravitation in the radiation gauge

   • W. B. Campbell

   Research Articles Pages: 137 - 147

4. The algebraic Rainich conditions

   • David Lovelock

   Research Articles Pages: 149 - 159

5. Electrovac fields with geodesic eigenrays

   • B. Lukács
   • Z. Perjés

   Research Articles Pages: 161 - 172

6. Book reviews

   • M. A. Tonnelat
   • Paul Wild
   • S. Mavridés

   BookReview Pages: 173 - 178

7. Bulletin GRG, no. 30

   Legacy Pages: 179 - 198