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Two fairly recent ones:-"Alpines: An Essential Guide" by Michael Mitchell. The Crowood Press, 2011"The Rock Garden Plant Primer" by Chris. Grey-Wilson. Timber Press 2009.Both, I think, obtainable from our Publications Manager, David Shaw.Good for beginners and improvers as well.
Oh yes, perennial weeds will be a nightmare - but think of the satisfaction when they're gone!!!
My wife's only downside to a rock garden is the scents won't come near to those of her flowers from her flower beds.