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UNITED STATES OF AMERICA, $1, Mary Golda Ross writing calculations, rocket launch,...
UNITED STATES OF AMERICA, ANNIE JUMP CANNON, CLASSIFYING THE STARS, DELAWARE,...
UNITED STATES OF AMERICA, TRUSTEES’ GARDEN, GEORGIA, hand planting seeds, orange...
UNITED STATES OF AMERICA, NEW JERSEY, Edison light bulb, ornaments.
UNITED STATES OF AMERICA, POLIO VACCINE 1953, PENNSYLVANIA, polio virus at three...