You'll find below, much of the links I used, there are surely many others but, generally just follow the links provided on these sites.
Travel diaries, reading, watching, as I say, to taste:
Si Belle La Terre"I do not understand German, so why?", will you tell me.
Well, the name of a location in the U.S. (or elsewhere) do not translate (or rarely), a map of hiking is always a map, a GPS point also and "translators" such as Google are there to help you. I found there lots of information and it is not my vague memories of German (2 years - 1966 and 67) who helped me a lot. So, don't hesitate!
1st Zehrer[s] Place: my favorite link, maps, GPS coordinates, descriptions, photos, ...Parcs nationaux de l'ouest américain (guide du routard)
Californie (guide du routard)
Ouest américain (Lonely Planet)
Californie - Arizona - Nevada - Utah (Petit futé)
Photographing the Southwest volume 1: Southern Utah
Photographing the Southwest volume 2: Arizona
These last 2 U.S. books, provide a wealth of practical information. Essential, in my opinion. They even followed us in the backpack during hikes.
A field guide to the Plants of Arizona: book purchased at the Visitor Center in Saguaro NP. Practice to try to identify many flowers that we met.
Before leaving, we bought maps of Arizona and Utah states. They have mainly served to "follow" the road, but they are not really necessary because we "drove" with the GPS. Anyway, we can find free maps at gas stations.
By cons, we have extensively used the mapping system on a PC from National Geographic: TOPO!. With this tool, we could prepare our own hiking maps (at 1 / 24 000th), determine the points for our car GPS (TomTom) and our touring GPS (Garmin Colorado). In total, I entered 254 points in our Tomtom and almost all were correct.