We are cleaning our our parents house and have many issues of NGM to sell. Our bound issues are volumes 22-50, but some volumes are missing. Here are the the volumes that we DO HAVE:
Vol 22 (Jan-June, 1911), Vol 23 (2 books 1912, complete), Vol 26 (July-Dec 1914), Vol 27 & 28 (all of 1915), Vol 29 &30 (all of 1916), Vol 31 & 32 (all of 1917), Vol 33 & 34 (all of 1918), Vol 35 & 36 (all of 1919), Vol 37 & 38 (all of 1920), Vol 39 & 40 (all of 1921), Vol 42 (July - Dec 1922), Vol 46 (July-Dec 1924. The bottom front spine is damaged), Vol 47 & 48 (all of 1925. There is some damage on the bottom front spine of Vol 48), and Vol 49 & 50 (all of 1926, there is small tear on the front bottom spine of Vol 50).
We also have what I believe is a complete set of individual issues for all of the 1940s through the 1960s. Most or all of these are dusty and musty smelling, but not water damaged or outright mildewed. If you are interested in particular issues, we could pull them and check them more closely for you. Also, there is an old book dealer in town and we could ask him to tell you how he would describe their condition.
Please let me know what questions we can answer for you.