volume
The name of a set of books that you use to locate information about a subject is called encyclopedias. With the introduction of the internet less people use encyclopedias today than they did in previous decades.
The set of encyclopedias could be measured by the number of volumes it contains. Alternatively, you could measure it by the total weight of all the books combined.
a book or set of books giving information on many subjects or on many aspects of one subject. It means course of instruction
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A set of 3 books or movies is typically referred to as a trilogy.
A set of books containing information about many different subjects is often called an encyclopedia. They could also be called collectively "Reference Works" if there is more than one type of information, such as dictionaries, maps, encyclopedias, etc.
You can try selling your Colliers encyclopedias, story books, and World Books on online marketplaces like eBay, Amazon, or Etsy. You might also consider selling them locally through classified ads, garage sales, or consignment shops. Additionally, donating them to libraries, schools, or charitable organizations could be another option.
what is the price?
Null Set is also called Void Set. Some books have even called it Empty Set.
A general reference book is an almanac or a set of encyclopedias.
Depending on what the publication information is for your set of 1917 encyclopedias, and what condition each book is in, your set could be worthless or worth thousands. To find out what your encyclopedia set is exactly worth, you will need to have an antique appraiser examine the set so that you have a definite price value.
A general reference book is an almanac or a set of encyclopedias.