The maximum weight for a U.S. semi truck and full trailer is 80,000 pounds spread over 18 conventional wheels. Out in the wide-open spaces of Australia, however, road trains can have four trailers and weigh in excess of 300,000 pounds.
Types of academic source. Sources such as newspaper articles, magazine articles, opinion pieces, and websites are not commonly academic, although there are some exceptions. Many journal articles and reports can be found online, for example. Academic journals are very different from popular magazines, although they bear several similarities.
American Poetry: Selected full-text books and articles. A primary source is a work that is being studied, or that provides first-hand or direct evidence on a topic. Common types of primary sources include works of literature, historical documents, original philosophical writings, and religious texts.