klevara:

to the CCF!
I have been collecting and studying coins for decades.
I am also a gem cutter.
Tucson has the biggest gem and mineral show in the World. One of my friends visits yearly. He has brought back some very interesting gem material for be to cut.
I might be worth buying some old coin magazines and going through the adverts. Phone a couple of them, to see if their business suits your requirements. At least that way you can get access to a range of dealers across the U.S. that may be of interest to you.
Perhaps you might it suitable to subscribe to a coin publication
In the first instance, visit the coin dealer recommended by IndianGoldEagle, and ask if he has any backdate issues of coin magazines that may be going cheaply. Read some of the articles, that should give you some idea of which area in numismatics that you would like to collect.