Dr. Connor Robins uses his time machine to grab extinct animals who are about to die anyway
(since things break down if he tries to alter the past), and he also a young actress who died
in a 1920s fire.
Kathleen M. Massie-Ferch, an avid geologist and writer, died of breast
cancer shortly after this story was published.
— Michael Main
You could steal all the cells you wanted to use in cloning, or some sperm and ova.
Anything, provided that the interaction changed nothing about their time-stream. We could
even pull some of the bodies forward.