This can take a while. From what I can tell, 1993 Duck stamps are worth a little less than twice their face value. The link below provides a catalog of all the state stamps and what you can purchase them for. Good luck!
The largest stamp collection in the U.S. belongs to the American Philatelic Society. Most are in agreement that the WWF Conservation Stamp Collection is the largest stamp collection in the world.
Yes, Stamp collecting is profitable. Collecting stamps is seldom profitable. Most collectors are severely disappointed in the amount of money they get when they go to sell their collections. You will be lucky to get half the cost of what you paid for the collection.
At collection of stamps is refered to as a stamp collection. They are frequently kept in albums. Philately is the name for the study and collection of stamps.
Many of the collections are valued in price close to $20 each. The exact price will vary depending upon the condition of the stamps.
The Dewey Decimal Classification for stamps is 769.54. This classification covers the topic of philately, which includes the study and collection of postage stamps.
Thematic collections can be made around any topic you wish.
Fireproff cabinets for your stamp collection are $500.00 and more.
Contact a stamp collecting society/organisation and ask them if anyone could help you. They would know better than anyone as that is their specialty. Ask them if you'd do better selling the collection as a whole, or selling the stamps in smaller groups or individually. Another idea is to take your collection (or part of it) around to a few shops that trade in stamp/coin collections and a few get quotes. Try getting at least three quotes to start to form a picture of what it might be worth.
It is typically referred to as a stamp album.
It all depends on your collection. Evaluating a collection is difficult and takes some research. Most are going to have minimal value. If you don't know what the value is, chance are you have many common stamps and little of real value. If you had purchased valuable items for the collection, you would already have a good idea of value.
The complete subject in the sentence given is "A valuable stamp collection".
There are a variety of auction houses and stamp dealers. Check your local yellow pages for dealers in your area. I would recommend obtaining a copy of some of the philatelic journals, Stamp Weekly or Lynn's Stamp News. There will be many ads offering to appraise collections. The American Philatelic Association can provide names and addresses of dealers also.