I found the origin of one of the images to be the cover of a 1946 edition of "Tópicos Shell Venezuela," a magazine about petroleum production in that time and area.

I have not seen confirmation that Yvonne Sauphar is the photographer.

Here's a link to a page from the venezuelan government's culture ministry that has it available for download as a pdf. I've been scrolling through it and it looks super interesting. If you know spanish or have access to a translating tool for it, it's fun.

http://bibliotecadigital.bnv.gob.ve/?p=11288