The book "encyclopedia of spares" by Dick Ritger is very, very useful. It pictures just about every spare, from both a right and left handed perspective.
The system of spare shooting is not outdated.
I also have the encyclopedia of strikes - and although it doesn't allow much for today's lane conditions, there is still a LOT of good basic information that's useful today.
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All things are difficult
before they are easy.
---- Thomas Fuller