Issues between the period of about 1914-1925 are available in uncirculated condition directly from Natl Geographic for around $40 dollars.
50-60 year old issues can be worth Up to $20 depending on the Relevance of the issue. Pre 1890 issues can be worth thousands.
The value of a full year of 1925 National Geographic Magazines can vary depending on their condition and demand among collectors. On average, a complete set in good condition could be worth anywhere from $100 to $500. It's recommended to have them appraised by a professional to get an accurate valuation.
http://ngscollectors.ning.com/
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$100
Most of the 1930's are not worth more than $8 to a collector. I could not find any issues in 1932 that were rare so I would assume your's would be worth 4 - 8 dollars. If you had a full year set it would probally bring you about $20 at auction. National Geographic magazines was a popular magazine. Unfortunately, to those people who saved all their issues over the years have found their " Collector's Value'' typically quite small. But that is not to say that yours is not rare, like most collectible items they usually gain dollar value with their rarity. I hope this help you out, I am sorry I can not tell you that your issue is worth alot. I hope you continue to figure out its actually value, I would suggest to take it to a local historic apraiser.
The national spelling bee, now known as the Scripps National Spelling Bee, began in 1925.
Worth McDougald was born in 1925.
Lind National Park was created in 1925.
Volcanoes National Park was created in 1925.
Lao National Museum was created in 1925.
Dart National Bank was created in 1925.
Alfred National Park was created in 1925.
Virunga National Park was created in 1925.
National Bar Association was created in 1925.
National Forensic League was created in 1925.
National Management Association was created in 1925.