This issue has variants.
Direct market editions have an inserted centerfold, on glossy paper and are 40 pages. This contains the Hostess ad, the CBS Saturday morning cartoon line-up and an ad for the MPC model kits. No newsstand editions have been found with this insert and have 36 pages, it seems to only exist in the Direct Market editions.
On-sale date from copyright registration.
Color credit provided by Anthony Tollin.
Robin's insignia appears (page 13, panel 5)