T. Barker

Spectrophotometry of planetary nebulae. I. Physical conditions.

T. Barker, 1978 .

Spectrophotometry of planetary nebulae. II. Chemical abundances.

T. Barker, 1978 .

Chemical abundances in a new halo planetary nebula

K. Cudworth, T. Barker, 1984 .

The Rise and Rise of Road Transport, 1700-1990

D. Gerhold, T. Barker, 1993 .

A history of London Transport

Theo Barker, Michael Robbins, M. Robbins, 1975 .

Low argon abundances in three halo planetary nebulae.

T. Barker, 1980 .