The FIAR books are great, and taken together they cover a wide range of social studies and science topics for the early elementary years. The one flaw – and it’s a big one – is the limited range of world cultures covered. FIAR was developed twenty years ago, and I’m guessing that at that point there might not have been many good books on these cultures which were widely available in U.S. libraries.
Fortunately, things have changed since then. I’ve been able to find a great list of FIAR-stlye books to cover Africa, Central and South America, and Southeast Asia, as well as a few books that address Native American topics from inside the cultures rather than from the standpoint of white observers. It’s still not exhaustive representation, by any means, but I think that for the target FIAR ages of 4-8 it’s a good start.
Some of these books have unit studies available for them at Homeschool Share, which I can use as a starting point for my own adaptation. For others, I’ll be starting from scratch. I am excited about these books! They’ve got a lot of richness to them.