This first image is the best one I have seen, marked as slide #115a, it has a label of “Jenny Lake.”

The next set are geysers or stink holes; the slide #127b has a label of “1st geyser” and the next (#128a) is labeled “do.” So, I need some help here. Did dad use “do” as an abbreviation of “ditto”?

For “ditto” here means “1st geyser,” according to the index.

The next one is #116a but this is confusing; the label is “JH wildlife antelope.” “JH” is probably “Jackson Hole” but I see no antelope.