Mattel Retailer/Trade Catalogs
Mattel sent these high-gloss catalogs to retailers and toy distributors to aid in merchandise sales. Many of these are over a hundred pages long, with detailed descriptions and full color images. Some items were in the pre-production stage so the pictures of packaging are sometimes only mock-ups.
Mattel 8-page Promotional Catalog
This eight-page, 8 x 10" catalog was probably given to toy shop owners to promote the MMM toyline. It appears to have the same images and text as the 1967 Mattel Retailers catalog. Many thanks to Keith Meyer for linking directly to images hosted on his site, www.majormattmason.net.
Mattel International 1968 Catalog
The Belgian example of this international catalog features several MMM items with captions in French and Flemish along with the Mattel International logo. More info and translations may be found on the Mattel International Page.
Mattel International 1969 Promotional Brochure
This is a straightforward 8-page brochure containing one page on each main Mattel toy line. Although signed by Mattel Toymakers, all texts in this brochure are in black only for easy translation/adaptation. No doubt this same brochure saw use in other markets and for various possible occasions.
This particular example is in french, there are also known copies in a flemish version. There's more information on the Mattel International Page.