MICROBE HUNTERS by Paul de Kruif
Pocket Book #49, 5th pr., 1940
MADAME CURIE by Eve Curie
Pocket Book 400, 1st pr., 1946

Condition of each: near very good

Here we have "the absorbing stories of the adventures of twelve explorers in the scientific world--that world unseen by the naked eye."
Including Leeuwenhoek, Pasteur, Koch, Walter Reed and Paul Ehrlich.
Here we also have the very personal
biography of Marie Curie, the discoverer of radium, by her daughter.
.