think you've been lucky with events, its a shame though that the book in the second one was has gone "missing" and one day it may turn up again.
a few years ago I leant a book from the 1960's to a fiend and lost contact with him and I couldnt remember the name of the book or the author, so my chances of finding another copy were slim. In recent years I've started volunteering at the local industrial museum, and look on ebay for collectable items from local manufactures to donate to the museum. On of my searched was for Campbell Engine as they were a local company that made gas, oil and diesel engine upto the 1920's......and when I saw the cover of the book in the listing, I eventually got a copy when I found one at a reasonable price.
and speaking of campbell engines, there was a small series of postcards that were made that showed Christmas Decorations in the factory in December 1918 when they were still making war munitions. There has been one of these on Ebay for £19 for a few years now. I did get one a couple of years ago for £6 but this came from Germany. I think this is more ironic than co-incindence. this was donated to the musuem.