Childcraft - How and Why
Okay, several scans from Childcraft: The How and Why Library, Volume 12, 1973 edition. I've seen dozens of these things over the years, and they're just about always good for a few nice illustrations, if not a whole bookfull. Naturally the earlier volumes feature more (and finer) illustrations and fewer photos, but this one still has a nice mix of stuff.

These first two examples are by cartoonist
Morrie Brickman. Reminds me a bit of Bill Hoest.

The next four were painted by Sharon Elzaurdia, Beautiful work, unfortunately I found next to nothing about her online.

These two pages are, obviously, from an article about the production of one of the
Peanuts television specials.

Artwork by Suzi Hawes.

This lovely piece is by Joyce John. Can't tell how it was executed... colored tissue paper? transparent markers? watercolor?

Pages by, respectively, George Suyeoka and Jerry Skolnick.

By Donald Charles.