Back Cover Blurb — Pyramid Books
THE
TIME
TUNNEL
was the most important — and secret — weapon ever developed.Scientists Tony Newman and Doug Phillips knew that the destiny of the world depended on it. Now the Tunnel was threatened with destruction — and the only-way Doug and Tony could save it was to take a blind leap into the whirling mists of time!

Back Cover Blurb — Pyramid Books
TIME BOMB

The experimental nuclear missile was sent through the Time Tunnel — but something went wrong...and it wound up buried in the capital of a great nation, over a century ago! Now, excavation equipment was moving toward the site — any day a bulldozer blade might set it off, destroying a mighty city and plunging the world into war!

Time travelers Tony Newman and Doug Phillips had only one chance to head off disaster — to go through the Time Tunnel and make the accident "unhappen." The trouble was, there was a war on in the past — and the bomb was in enemy territory...