Which of the following is best described as a "secondary source" for analysis of the war between the United States and Vietnam in the 1960s and 70s? Question 3 options:
A student's analysis in 2018 of the viewpoints about the war expressed in newspaper coverage during the war

a diary passage written by a Vietnamese soldier describing his role in a battle against American troops

a letter written during the war by an American soldier stationed in Vietnam

a recording of a radio program broadcast during the war by the American military
Which of the following sources is best described as "primary" for analysis of the 1918 flu epidemic?

Question 4 options:

a study (published in 2016 by the Center for Disease Control) about the causes of the epidemic

hospital records of flu cases in 1918

a magazine article (published in the New Yorker magazine in 1985) about the epidemic

a History Channel documentary about the epidemic