Another transitional booklet is the one for 1972-1973

The covers of the early 1973 and late 1973 booklets
may look the same, but there are slight differences.

As more doll hair products were introduced in 1973,
they were pictured in the booklet published later that year.

On the top are two pages from the early 1973 booklet,
with the added plane and dune buggy in the later booklet.

The back of the early 1973 Barbie booklet is basically blank,
while the later version pictures the extremely rare Vanity Case.

Despite what you read in Barbie reference books, there were no Barbie booklets specifically for 1972  in the United States.  This is what you WILL find, however, if you are lucky, as the two booklets I am talking about are rare.
One booklet is dated 1972, The Beautiful World of Barbie, and must have been released in early 1973.  The front features Quick Curl Barbie from 1973; the back is blank except for the Mattel logo.  Inside you will find Quick Curl Barbie, Kelley, Francie and Skipper (1973); Mod Hair Ken (1973); the Barbie Beauty Center (1973); Busy Barbie Ken, Steffie and Francie (1972); Talking Busy Barbie, Ken and Steffie (1972); Malibu Barbie, Ken, Francie and Skipper (1971); Malibu PJ (1972); Pose N Play Skipper and Tiff and the Swing-A-Rounder Gym (1972); the Country Camper (1971); the Camp-Out Tent (1972); Garden Patio (1972); Hair Originals (1972); the 1972 and 1973 Best Buys for Barbie, Ken, Francie and Skipper; the shoe packs from 1972; and various cases from 1969 and 1970.
The second booklet is dated 1973, The World of Barbie, and shows only 1973 items: the Quick Curl dolls plus Miss America; Mod Hair Ken; the Quick Curl Boutique; the Malibu dolls; the Country Camper; the Camp-Out Tent; the Friend Ship (1973); Goin' Camping Set with the Tent Trailer and Dune Buggy (1973); the Country Living Home (1973); the Surprise House (1973); the Get Up N Go outfits for Barbie, Ken, Francie and Skipper (1973); the 1973 Best Buys for Barbie, Ken, Francie and Skipper; 1972 Hair Originals; Beauty Center; the 1972 shoe packs; and the 1973 Sew Magic Machine and extra sewing packs.