ISBN-13: 9781491238226 / Angielski / Miękka / 2013 / 34 str.
ISBN-13: 9781491238226 / Angielski / Miękka / 2013 / 34 str.
In 2009 the National Park Service (NPS) completed its second Comprehensive Survey of the American Public, a nationwide telephone survey consisting of 15-minute interviews with 4,103 respondents across the United States. Both landline and cellular phone numbers were randomly sampled, and interviews were conducted in Spanish as well as in English.