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Distribution of glaciers in North America (a) in the late twentieth century, and (b) 18,000 years ag
Vision with macular degeneration is experienced with an inability to focus in the center of the visu
Medicinal leeches on a patient’s neck. Today leeches are sometimes used in microsurgery to prevent b
Combustion chamber volume is the volume above the piston with the piston at top dead center.
17th Century Physician Examining a Urine Specimen