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I found these two tiny accordion address books amongst the personal effects of my recently deceased parents-in-law, Leon Ishkanian and Alice Tchakedjian in Heliopolis, Egypt earlier this year. They both appear to be address books for specific holiday destinations: Sydney, Australia and California, USA. Individual pages for each are 3.75" x 2.5" with an opened length of 21.5" & 23" respectively. The back and front panels of both books are magnetized in order to keep the publication firmly closed. Two very interesting booklets in terms of their function, economy of size and the ease with which the relevant information can be scanned and retrieved.
Here's a link to a blog about my trip to Cairo in January, as well as another trip that I had to take in February under very different, and tragic circumstances: Egyptian Dispatches