Penguin Publishing 75th anniversary

Just read in a copy of the Guardian newspaper that the classic Penguin books that we all know and feel nostalgia for is celebrating its 75th anniversary. What's the connection with Mrs Mallowan? According to the article, Allen Lane thought of the need for cheap, quality books after visiting with Agatha in Devon. So, it seems she inspired a revolution in publishing. He pushed forward his idea and Penguin Publishing was launched on 30 July 1935. Hmm, she would have been thinking about the first dig at Chagar Bazar which was due to start in the late autumn that year. Now that my eyes are alert for information about Agatha Christie, particularly in that period of time, it seems to come at me from all directions. Green was the colour code used for the covers of crime novels published by Penguin. Wonder if I can find one somewhere in a second hand bookshop.