Hi Morton,
Virtual Moon Atlas is my ultimate resource. Can be configured not only to what ever view your scope gives, but also the level of detail, libration, date, scale, you name it, it's there. Notes not just the typical features, craters, riles, etc, but also pyroclastic flows & domes (volcanos) - something very few atlas do.
Free download too.
Below is a screen shots of the craters Posidonius & Alphonsus. The Numbers correspond to volcanic domes and/or pyroclastic deposits.
On my phone I carry the app "LunarMap HD". Also very good, but a step below Virtual Moon Atlas. The low res app is free, the higher res app has a small fee.
Out in the field I start with the app for gross nomenclature, and then refine my info with the laptop.