A "Giant Durabook" - Distributed by Modern Promotions
Copyright 1973 Hanna-Barbera
8.5 x 11 inches, 14 story pages, written by Horace Elias

Each Durabook has two editions: a thick cardboard "Durabook" cover and a hardcover for libraries. There are at least two variations of the cardboard cover for "Salt Plot." One has a "Durabook" logo near the "79¢" price. The other version has a "Paul Hamlyn" logo near the price. Paul Hamlyn was a British publisher, but it's still likely this was sold in America because it has an American price. There may be a third variation with the price but no logo, as with the "Secret Tunnel" book, but we haven't found one.

The backs of the cardboard books have the same artwork as the front except for the price.

Here's the plot: Dinner on Palm Key is interrupted by news that Dr. Mephisto Chang and Hugo Xippe have created a chemical that will turn any body of fresh water into salt water. They threaten to blow up two populated islands if their demand to control all world governments is not met. (So, there's no threat connected to the chemical?) Nuclear submarines take Dr. Quest and Jonny to one island, and Race and Haji to the other. The adults allow themselves to be captured as a diversion while the kids jam the signals to detonate the islands and also destroy the salt chemical with a chemical Dr. Quest has created. Then the bad guys are apparently captured.

Note: This is the only Durabook with Hadji, but his name is spelled "Haji" throughout. That was the spelling on an early model sheet for the character, so maybe that was the source of the misspelling.

The other Jonny Quest Durabooks are: "Jonny Quest and the Lost City" and "Jonny Quest's Adventure with the Secret Tunnel."

As mentioned above, the hardcover editions were for libraries, so they do not have prices on the covers.

There appear to be two variations of the hardback as well, but just by color. We found the orange one on Amazon, but it's not in stock. Each has text on the back that reads,