The Elecraft K3 Bible
Most manuals you get are not really something that can be read from start to finish, and I certainly found the Elecraft K3 Instruction Manual very hard to read, maybe it’s my ongoing ilness, but although I found most things on the radio, easy to sort out without the manual, some functions I was getting in a right mess with.
Someone thankfully posted a link on the Elecraft K3 Groups.io forum which if you have a K3 you need to be on, it is a great source of hints, tips and ideas for troubleshooting problems.
It arrived about about 2 weeks after ordering, which is not a problem, the order is done USA side, but I think it is printed in the UK or the country that you are in and then sent out locally, nothing there really a problem.
The manual itself was much better than expected, a lot thicker than I was expecting, printed on quality paper, and so worth ordering, if you own a K3 then this is possible the best upgrade that you can do, well except the P3 which I still need to find.