50-point census operators guide : a supplement to RRL report no. 9
Kember-Smith, J.
50-point census operators guide : a supplement to RRL report no. 9 - Crowthorne, Berkshire : Transport and Road Research Laboratory, 1978 - 6 p - Transport and Road Research Laboratory. TRRL supplementary report ; no. 431 .
Traffic surveys
TE7 T72 no. 431
50-point census operators guide : a supplement to RRL report no. 9 - Crowthorne, Berkshire : Transport and Road Research Laboratory, 1978 - 6 p - Transport and Road Research Laboratory. TRRL supplementary report ; no. 431 .
Traffic surveys
TE7 T72 no. 431

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