At some point in the early twentieth century, someone sent Miss Bertha Hazelton of Mooreland, Indiana, a Postcard Book. For some people, the phrase “postcard book” conjures up an image of a book of postcards: the kind of thing for sale at many tourist attractions that holds eight, twelve, sixteen, or more souvenir postcards. This isn’t that kind of postcard book. As you can see, it is quite literally a postcard featuring a small book. In person, the card appears quite flat. If it were put through a modern mechanical mail sorter, it might survive–so long as it went through the right way. The wrong way would risk tearing off…