On the distances and luminosities of stars of spectral type G as derived from their proper motions. L. M. II, 25.
Price: 5 Kr.
C. V. L. CHARLIER:
Introduction to Stellar Statistics.
Price: 4 Kr.
NILS H. RASMUSON:
A Research on moving clusters. L. M. II, 26.
Price: 5 Kr.
SIGFRID RAAB:
A Research on open clusters. L. M. II, 28.