At last, the acclaimed work of the official cartographers can be examined as they intended, in full colour. Due to the number of full-colour maps bound into volumes of 'War in the Air', previous attempts to reprint this valuable reference either floundered, or were produced with the maps in monochrome, or missing completely. With our 2020 reprint of the six text volumes of 'War in the Air', all bound-in colour maps are present and correct. An A4 printing size has been adopted to allow little or no reduction to this colour mapping; this larger format has also allowed a 20% increase in type sizing to the text pages that was previously rather small in the original editions. This new Supplementary Map Volume will allow those with previous reprints of 'War in the Air' to have the convenience of access to them in colour without the expense of purchasing the full set of six volumes.