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1930s: Animation of expiration process with label "Back to lungs for purification".

1930s: Animation of expiration process with label "Back to lungs for purification".

1930s: Interior of body with hands showing lungs and heart underneath it.

1930s: Interior of body with hands showing lungs and heart underneath it.

1930s: Intertitle "Normal position of kidneys, ureters, and bladder". Real organs are displayed. Intertitle "The veins of the kidneys join the vena cava, and the arteries spring from

1930s: Intertitle "Normal position of kidneys, ureters, and bladder". Real organs are displayed. Intertitle "The veins of the kidneys join the vena cava, and the arteries spring from

1930s: Line extends to surface of illustrated globe. Animated arrows swirl in space near globe.

1930s: Line extends to surface of illustrated globe. Animated arrows swirl in space near globe.

1930s: Line extends to surface of illustrated globe. Animated arrows swirl in space near globe. Artic circle and Equator lines appear over map of Earth. Grass huts on edge of jungle.

1930s: Line extends to surface of illustrated globe. Animated arrows swirl in space near globe. Artic circle and Equator lines appear over map of Earth. Grass huts on edge of jungle.

1930s: Microscopic view of tadpole gills as blood rushes through them. A tadpole from below, it's feathery gills illuminated.

1930s: Microscopic view of tadpole gills as blood rushes through them. A tadpole from below, it's feathery gills illuminated.

1930s: UNITED STATES: doctor takes patient's pulse. Doctor listens to pulse on patient

1930s: UNITED STATES: doctor takes patient's pulse. Doctor listens to pulse on patient

1930s: UNITED STATES: open wound on leg of patient. Physician applies tourniquet to leg.

1930s: UNITED STATES: open wound on leg of patient. Physician applies tourniquet to leg.

1940s: Graph of average weekly circulation of four high school newspapers. Axis are drawn. X axis marked with months. Y axis is marked with number of copies circulated.

1940s: Graph of average weekly circulation of four high school newspapers. Axis are drawn. X axis marked with months. Y axis is marked with number of copies circulated.

1940s: Graph of average weekly circulation of four high school newspapers. First data point for September is plotted.

1940s: Graph of average weekly circulation of four high school newspapers. First data point for September is plotted.

1940s: Group of students and teacher in a classroom looking at blackboard. Hand-drawn graph of Income Derived from Circulation. Teen boy explains graph to group.

1940s: Group of students and teacher in a classroom looking at blackboard. Hand-drawn graph of Income Derived from Circulation. Teen boy explains graph to group.

1940s: Hand-drawn graph of income derived from circulation. Calculations needed to plot points.

1940s: Hand-drawn graph of income derived from circulation. Calculations needed to plot points.

1940s: Hand-drawn graph of income derived from circulation. Red arrow points to Origin where x and y axis meet.

1940s: Hand-drawn graph of income derived from circulation. Red arrow points to Origin where x and y axis meet.

1940s: Hand-drawn graph of income derived from circulation. Red arrows move on graph to form plot points. Line connects plot points.

1940s: Hand-drawn graph of income derived from circulation. Red arrows move on graph to form plot points. Line connects plot points.

1940s: Hand-drawn graph of income derived from circulation. Red line and black drawn on graph.

1940s: Hand-drawn graph of income derived from circulation. Red line and black drawn on graph.