Here are some factors that can affect the value of a 1937 Reader's Digest book:
* Condition: The condition of the book is one of the most important factors that determines its value. A book that is in good condition, with no major tears, stains, or damage, will be worth more than a book that is in poor condition.
* Rarity: Some issues of the Reader's Digest are more rare than others. Factors that can affect rarity include the size of the print run, the date of publication, and the content of the issue.
* Popularity: The popularity of a particular issue can also affect its value. Issues that feature popular authors or articles may be worth more than issues that do not.
* Historical significance: Some issues of the Reader's Digest have historical significance, which can increase their value. For example, the December 1941 issue of the Reader's Digest, which was published shortly after the attack on Pearl Harbor, is a highly sought-after issue.
If you are interested in selling a 1937 Reader's Digest book, it is a good idea to do some research to determine its value. You can do this by looking at online auction sites or by consulting with a book dealer who specializes in vintage magazines.