Old Xochimilco canal photo

This is an old photograph of women  harvesting crops  selling goods from a boat in a canal connected to  the chinampas south of Mexico City, probably in the 1920s. My daughter purchased it from a dealer in old photographs, who has no information about its origin. Does anyone have a clue about who might have taken the photo, when and where?  The name "Scott" is penciled in at the lower right.

Please contact me if you know anything about this. I am thinking about using this in the 3rd edition of my book, The Aztecs, but I'd like to know more about the photo before deciding to include it.  

I have found an alternate old photo, this one with a chinampero along the chinampas. Maybe I will post it at some point.

And what does this have to do with Calixtlahuaca, you might ask. Well, the lakes around Tenochtitlan, and in the southern part of the Basin of Mexico, were filled with chinampas in Aztec times. The high productivity of this form of agriculture is one reason why Tenochtitlan conquered Calixtlahuaca, rather than the other way around.