dkurth·ปีที่แล้ว·discussSad to hear! I noticed that some are available through the Internet Archive:https://archive.org/details/Hexaflexagons
dkurth·2 ปีที่แล้ว·discussYou often don't know which work was "10x" except in retrospect, so this advice is a little like recommending people only invest in the stocks that are going to go up.
dkurth·3 ปีที่แล้ว·discussI solved this problem by taking a photograph of my library card. To check out a book, I load the picture and hold it up to the scanner.
https://archive.org/details/Hexaflexagons