Everything you need to understand or teach A Gun for Dinosaur by L. Sprague de Camp.
"A Gun for Dinosaur" is a thrilling time travel adventure whose action takes place millions of years ago. Reginald Rivers, hunting guide extraordinaire, hears that a time travel machine has been invented and immediately knows what that means: New opportunities to make money! Rivers and his partner Aiyar, hereditary monarch of Janpur, rush to the inventor of the machine only to discover, "There were other hunting guides and no end of scientists, each...
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L(yon) Sprague de Camp