I also purchased a few little trail maintenance books from the NY-NJ trail conference, but they are more like pamphlets then books.
Bike paths have their place, but bikes are by no means limited to such flat and wide trails.
Don't let anyone tell you a trail is unfit for bikes because it is too technical. Here are some of the best Trail Work links I've found. IMBA's TCC- getting started on building a new trail. Drainage, slopes, and building sketchy bridges. Also letters to land managers.