Publishers G. T. Foulis specialised in motor sport books and are now part of the Haynes Publishing Group who produce vehicle workshop manuals Haynes Manuals.
The firm originated with the Edinburgh publisher, T. N. Foulis, which was founded in 1903. T. N. Foulis ceased in 1924, and was taken over by the Henley printer G. T. Marshall, and traded as G. T. Foulis, based in London. It initially seems to have been general book publishers, but soon specialised in books about transport
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G. T. Foulis Wikipedia(Text) CC BY-SA