Who said "Take only pictures, leave only footprints"?

It's a great quote I learned to live by in Boy Scouts and I want to use it again for a photo project.
I need a quote to go with my pictures and I've got a ton of pictures of my friend and I hiking tons of different mountains.
I'd be okay if its an unknown source. But I'd prefer to know who said it for the purposes of this.

Thanks for any help you can give! :)

Anonymous2011-10-31T12:14:36Z

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that sounds like something Ansel Adams would have said, but i don't really know

?2016-11-05T16:21:08Z

Leave Only Footprints Quote

Anonymous2015-08-06T09:29:35Z

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RE:
Who said "Take only pictures, leave only footprints"?
It's a great quote I learned to live by in Boy Scouts and I want to use it again for a photo project.
I need a quote to go with my pictures and I've got a ton of pictures of my friend and I hiking tons of different mountains.
I'd be okay if its an unknown source. But I'd prefer...

Sam2011-10-31T13:04:35Z

I know that the National Trust used it, but I don't know whether they came up with it or not

Slightly longer version;
Tread lightly, take only pictures, leave only footprints, kill only time