Guide books and maps
Several guide books and maps covering the Moselle cycle path are available. If you want the best maps, go for the blue spiral-bound booklet published by Esterbauer (scale 1:50,000). If cycling between Trier and Koblenz, having a detailed map is not that important. The cycle paths are mostly on both sides of the river and very well signed. So 'The Moselle Cycle Route' by Mike Wells (Cicerone Press) might work out too.
In case you like to aquaint yourself with background information about the region, have a look at following publications: