Is this a useful resource for a first crevice garden?
Crevice Gardens and Their Plants by Zdeněk Zvolánek
It is not a book I have but i can't imagine that it would not be extremely useful!
It sounds from this Alpine Garden Society bookshop description as though the updated 2015 version has not been made available yet:
Jyang201 - you may be interested in this section of the Scottish Rock Garden Club's Forum : http://www.srgc.net/forum/index.php?topic=4656.0 where crevice gardens of all types are discussed - many made by Zdenek Zvolanek, whos is also part of the International Rock Gardener e-magazine team with me.