The Daisy Hartnall Gallery

There are now 8 cards received by Daisy aka Marguerite Hartnall in the period 1906-1908. They have now been given their own Gallery. (As of today only 5 of the 8 have their own page and the others will follow shortly) Why have they survived? Where have they been before they turned up in a book shop in Greenwich? Daisy married in 1921 and died in 1967. Her husband died in 1943. Her son died in 1997.