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In part it will depend on what is in the collection and big it is.
There are dealers who will be happy to buy it but the amount you would get that way will be a very small fraction of whatever its value may be.
If there is anything of major historical importance then please consider talking with the major museums such as the Air and Space Museum in Washington or the National Museum of the United States Air Force in Dayton, Ohio. There are others that are not as big in the U.S., and there are others of equal size and importance in other countries. However you will need to keep in mind that reputable museums will only be interested in objects of real historical significance since every object they accept will have to be cared for which costs them money and they all have tight budgets.
If there are good collections of rare books - not ones that were printed in the past couple of decades - or collections of original photos or documents then there are a number of libraries that are interested in such collections and make them available to the general public. Some of these are attached to the big museums, but there are also others that are attached to major universities.
If you wish to sell things, the best place to get the most money for things is Ebay. If you have a very large amount of material you can group things of lesser value to make it go faster. Ebay will get you the market value for your things in 90 percent of the cases, or it will get you above market value or below market value in a small percent of the cases but that evens out when selling many things. You can let people here know when you put things up for sale on Ebay so they will be sure to look at them if they are interested. The important thing there is to have several good quality photos and to start your bidding at a very low price to generate bidding interest. Keep in mind that most serious bidding usually comes in the last hour or even the last seconds of an auction.
Selling privately to an individual is a crap shoot - though most of the time you will not get as much as you would if you went to Ebay auctions.
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