Use a book? You can probably remember "Page 32, Line 7" is the passphrase for site N and you've got oodles of data to work with for generating the passphrase.

Use a book? You can probably remember "Page 32, Line 7" is the passphrase for site N and you've got oodles of data to work with for generating the passphrase. You can probably even mark the passphrase itself if you have a lot of other marked passages in the book as if you were doing research. Probably want to carry 2-3 other marked books as well to avoid highlighting any specific one as "valuable". (Disclaimer: I am not a spy, take advice from real spies before me.)