The measurement of nitrogen dioxide by simple diffusion tubes

by N.P Walker
Published 1985-12-01

The use of diffusion tubes to measure NO₂ in South Africa

by N.P Walker
Published 1987-12-01

A COMPARISON BETWEEN SOILING INDEX AND TOTAL CARBON CONCENTRATIONS

by N.P. Walker, R.H. Ellerbeck
Published 1986-06-01

NATIONAL SURVEY OF SMOKE AND SULPHUR DIOXIDE : QUALITY OF SMOKE MEASUREMENTS

by N.P. Walker, R.H. Ellerbeck, E. Kemeny
Published 1986-06-01