If you want a physical USA map for quick reference try this app!

You can study and learn the most important geographic regions and cities.

Features:

• Physical USA map with most important cities.
• It is not required an internet connection to explore the USA map.You can see it anytime offline.
• Zoom control with gestures.
• USA map reference with a lot of geographic points: rivers mountains lakes seas islands peninsulas capes gulfs straits canals plains depressions deserts and the most important cities.

Try this free app for android you will have a complete USA map reference in your device.