©
Mafac_Brakes: Holdsworth-Bike-Riders-Aids-1961-UK_cvr-mafac
©
Mafac_Brakes: Holdsworth-Bike-Riders-Aids-1962-UK_cvr-mafac
©
Mafac_Brakes: Holdsworth's "Bike Riders Aids" 1964-65 UK cover+Mafac page