Need help identifying which volume no. these images appear in!! (1970-90s)

[Hannes]

Hi all!

I am doing a little national geographic research project and I am interested in identifying the volume # that the following images appeared in. I am hoping to find some helpful minds with impressive collections to help me out with this :) These should've appeared sometime in the 1970s, 1980s or 1990s. If you feel like you recognize these images from your editions, please take a look and let me know if you happen to find one!

I've uploaded and labeled the images on Imgur:

https://imgur.com/a/LaUfeaR

Hope to hear back from some of you !

Best,

Hannes

[Travis Fatzinger]

#1 Dec 1974

#2 Dec 1984

#4 Oct 1993

#7 May 1993

#9 Mar 1974

#13 Sept 1981

#14 Sept 2000

#15 Aug 1982 Sinkholes

[Hannes]

Hi there :) thank you so much!

If you ever find a spare moment, do you think you could possibly send me pictures of those pages so that I can make sure I order the correct ones on ebay?

I would greatly appreciate it :)

Best