Kalmbach Publishing (Fine Scale Modeler's parent company) has some good model railroad books...
http://www.kalmbachstore.com/modeltrains-railroading-model-railroading-books-scenery.html
Also, aside from the required (IMHO) diorama book to own, How to Build Dioramas by Shep Paine, you should also have on-hand from Osprey Modeling Manuals, Volume #7- WWII Dioramas. It covers the build of two dioramas (one Urban setting, one in the Normandy Bocage Country). The first one (The Operator) shows a German "REMF" (Rear Echelon Mother F***** to us line doggies) chattin' it up with a well-endowed local gal as a veteran Infantry squad, some wounded, all tired & dirty, fresh from the fight, passes by the two (with varying degrees of contempt at the REMF's apearance, impecable uniform & car) on a cobblestone street that runs by a bombed-out multi-story building, and includes the NCO's Citroen rag-top... The construction techniques and materials for the building, sidewalk, and street are laid out in detail.
The second depicts two British Churchill Mk VI tanks crashing over a hedgerow right onto a mixed bag of Heer and Waffen-SS troops with MG 42s and Panzerfausts with the Infantrymen in various stages of "fight & flight" and several casualties.. The terrain is a combination of a hedgerow, stone wall, dirt road and cabbage field with the well-foliaged hedgerow and some trees... As in the first diorama, the construction of the stuctures, terrain, and foliage are laid out in detail, from making cabbages and stone walls to entire trees and bushes...
Also, here's a link to some of the diorama construction tipsheets that Shep Paine did for Monogram in the 70's... These things are what most every diorama builder over 40 got started with.. At least, I did...
http://sheperdpaine.atspace.com/index.htm
There's others available in pdf format for dwnloading, although I can't find the link right now... I'll post it later on when I have more time today..
Here it is:
http://sheperdpaine.com/monogram/index.htm