"The first books appeared between 1915-38, and were printed on cheap, puffed up paper with titles such as Tails of Ships and Trains, Farmyard Panorama and Nursery Rhyme and ABC Book - although ‘A’ in those days stood for armoured train!
The books were an instant hit with children, and at half a crown, or 2’6, were equally popular with parents who knew a good bargain when they saw it.
Thanks to a standardised 56-page format made from just one sheet of paper, Ladybird books were not expensive to produce – and for this reason, they kept the same price (and their popularity) for the next 29 years.
After the second-world-war, Ladybird expanded into educational non-fiction with the launch of the now globally recognised Key Words Reading Scheme. This was followed in the sixties by the Learnabout Series, which put Ladybird at the forefront of educational publishing with books consulted as much by adults as by children." -via Culture 24
These vintage titles are being re-issued by Ladybird, or keep eyes peeled on ebay.co.uk.